Malicious PDF — malware analysis report

Static analysis result for SHA-256 266f7070906d560e…

MALICIOUS

PDF

40.9 KB Created: 2019-04-03 18:29:53 +03:00 Authoring application: Acrobat PDFMaker 8.1 for Word (via Acrobat Distiller 8.1.0 (Windows))
MD5: c38ceef550881a0396aace3f2ce51020 SHA-1: ca0e5e627c0bf4b94df4d72ede54da9c09555015 SHA-256: 266f7070906d560e3caf0705a9a9c976d9a94ba8fe748332ecf26fd99d413f10
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier as malicious and contains a large number of embedded links to external PDF files hosted on gorillawalker.com. This behavior is consistent with a link farm or SEO poisoning attack, potentially used to distribute malicious content or manipulate search rankings. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific intent beyond link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9027

Heuristics 2

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://www.gorillawalker.com/engineering-of-words-portuguese-edition-kindle-edition.pdf
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    • http://www.gorillawalker.com/legends-of-the-pendragon-pendragon-fiction-6211.pdf
    • http://www.gorillawalker.com/selected-sections-on-nonprofit-organizations-statutes-regulations-and-forms-selected.pdf
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    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://www.aiim.org/pdfa/ns/extension/
    • http://www.aiim.org/pdfa/ns/schema#
    • http://www.aiim.org/pdfa/ns/property#
    • http://www.aiim.org/pdfa/ns/id/

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