Malicious PDF — malware analysis report

Heuristics 4

• PDF links to a request-capture / data-exfiltration sink high PDF_EXFIL_SINK_URL
  PDF has a clickable HTTP(S) action whose destination is a request-capture / exfiltration endpoint (webhook.site, requestbin, beeceptor, pipedream, interactsh/OAST, burpcollaborator, canarytokens) or a throwaway tunnel (ngrok, trycloudflare). These services exist to receive arbitrary inbound requests, so they are essentially never a legitimate destination for a document link — the file is exfiltrating recipient/credential data or staging C2.
• Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
  PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 30 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
• External URI info PDF_URI
  PDF contains an external URL action
• Embedded URL info EMBEDDED_URL
  One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
  URL https://bool-watt-skilled-taste.trycloudflare.com/NGUxNTFZMzI1djczN0w= PDF link annotation

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