How to Investigate Suspicious URLs Like a SOC Analyst – Top Tools & Steps Explained

Table of Contents

• Why Are Suspicious URLs a Threat?
•  Workflow for URL Investigation as a SOC Analyst
•  Top Tools Every SOC Analyst Should Use for URL Investigation
• What to Look for When Investigating a Suspicious URL
•   Example: Investigating a Suspicious Link
• Best Practices for SOC Analysts
• Sample Report Template for URL Investigation
•  Conclusion
•  Frequently Asked Questions (FAQs)

In today’s digital threat landscape, malicious URLs are among the most commonly used weapons in phishing, malware delivery, and command-and-control (C2) operations. As a SOC (Security Operations Center) Analyst, the ability to quickly and accurately investigate suspicious URLs is a critical skill that can help prevent data breaches and system compromise.

This blog will walk you through the process of investigating URLs, introduce the top tools used in the industry, and explain how to interpret results effectively.

 Why Are Suspicious URLs a Threat?

URLs can act as:

• Phishing vectors – Trick users into revealing credentials.

• Payload delivery points – Drop malware or scripts.

• Redirects to exploit kits – Lead users to vulnerable web pages.

• C2 channels – Used by malware to communicate with threat actors.

Real-World Example:

In 2024, a major financial firm was breached via a phishing email containing a shortened URL. The link redirected to a clone of their internal VPN portal and captured employee credentials, causing a 3-week disruption.

 Workflow for URL Investigation as a SOC Analyst

 Top Tools Every SOC Analyst Should Use for URL Investigation

1. VirusTotal

• Aggregates antivirus engines and URL reputation databases.

• Provides IP/domain WHOIS, detection rates, and sandboxed behavior.

2. URLScan.io

• Scans the URL and presents how the page loads, domains contacted, redirects, etc.

• Visual interface for DOM structure and network requests.

3. Hybrid Analysis

• Lets you analyze files or URLs in a sandbox.

• Good for detecting malicious behavior patterns like data exfiltration or exploit attempts.

4. Any.run

• Interactive sandbox with real-time process analysis.

• Especially useful when the URL drops a file or redirects to malware.

5. PhishTool

• SOC-focused interface that helps analyze phishing URLs in emails.

• Integrates DMARC, SPF, DKIM checks, and links to threat intel sources.

6. Google Safe Browsing

• Checks if a site is reported as phishing or malware-hosting.

• Built into Chrome and available via API.

7. Talos Intelligence (Cisco)

• Provides WHOIS data, DNS lookups, and domain reputation.

8. ThreatCrowd / VirusBay / URLhaus

• Passive threat intelligence feeds showing malicious domains and payload history.

9. Shodan

• Search for exposed services or systems behind a URL/IP.

10. WhoisXML / Domaintools

• Perform deep WHOIS lookup to find creation date, owner, registrar, and possible IOC links.

 What to Look for When Investigating a Suspicious URL

 Example: Investigating a Suspicious Link

Let’s say you receive the URL: http://verify-login-alert[.]net/login.php?user=admin

Steps:

1. Submit to VirusTotal → Found 6 AV engines flagging it as phishing.

2. Scan on URLScan.io → It loads a fake Microsoft 365 login page.

3. Use WhoisXML → Domain registered 2 days ago from a registrar in Panama.

4. Sandbox in Any.run → Captures credentials and redirects to legitimate Microsoft page.

Result: Marked as phishing, added to denylist, users alerted.

✅ Best Practices for SOC Analysts

• Never click URLs directly. Use curl or wget in controlled environments or sandboxes.

• Correlate findings. Use multiple tools to avoid false positives/negatives.

• Record every detail. Log timestamps, IPs, domain age, sandbox behavior.

• Automate with SOAR. Many of these tools have APIs and integrations to automate triage.

Sample Report Template for URL Investigation

Conclusion

Investigating URLs is one of the most frequent and critical responsibilities for SOC analysts. With phishing and malware becoming more targeted and deceptive, your knowledge of the right tools and workflows can make the difference between a blocked attack and a successful breach.

Always assume the worst until proven otherwise — investigate every URL like it’s a loaded weapon.