Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d2bf81b9c2f1bb…

MALICIOUS

PDF

42.6 KB Created: 2018-11-14 20:02:48 +03:00 Authoring application: PScript5.dll Version 5.2.2 (via Acrobat Distiller 11.0 (Windows))
MD5: 9090e3ec09e41ee5ecc2ab33e5624a0f SHA-1: 4bf662310c5b261ef82d0eb61627b2dfe5a072a7 SHA-256: f1d2bf81b9c2f1bbecb999bd79a744fa2d9b98f0e75dcb90f164240cc83540dc
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links to external PDF files, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier also flagged this document as malicious. The primary attack pattern involves directing users to a link farm hosted on www.gorillawalker.com.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9181

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/g-henle-verlag-6-suites-for-violoncello-solo-bwv-1007.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/
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    • 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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