Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcae77a2d05cf332…

MALICIOUS

PDF

529.3 KB Created: 2023-12-20 11:10:07 -05:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75885b3572ba4592c8f904acbd5af60e SHA-1: 329f403329483db5121af6ea0e4040b1aa785611 SHA-256: fcae77a2d05cf3327e9eb5bf397f2c98553675977afd2fb4c1e0bd018cffe4fe
80 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF document contains multiple invisible links designed to trick the user into downloading a JavaScript file. The heuristic PDF_REPEATED_PAYLOAD_LINK_LURE specifically identifies this behavior and points to a Dropbox URL. The PDF_IMAGE_ONLY_LURE heuristic indicates the document is image-based, further suggesting a deceptive presentation. The embedded URL is likely intended to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0948

Heuristics 3

  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • PDF paints image(s) but contains no text operators medium PDF_IMAGE_ONLY_LURE
    PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
  • 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://www.dropbox.com/scl/fi/9h6bpaisvafq0oud5i93y/PDF_updt2.js?rlkey=i01wl4fh2zwgid9vgytaodbiw&dl=1

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