Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3c74cfdca98584…

MALICIOUS

PDF

42.9 KB Created: 2018-11-15 05:57:16 +03:00 Authoring application: Microsoft Word: AdobePS 8.7.3 (301) (via Acrobat Distiller 5.0.5 for Macintosh)
MD5: b213f2fce8bf71fc3a3e4b089153ced9 SHA-1: 2e02d0afd7d1e4c3f245dfe34742c4372b1a0910 SHA-256: 6d3c74cfdca985846e330593f9fa74524503c00b13f0b7cd7f96f10a079ec1ab
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links to external PDF files, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged the document as malicious. While no scripts were explicitly extracted, the structure suggests an attempt to manipulate search engine results or redirect users to potentially malicious content hosted on 'gorillawalker.com'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8469

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/fig-the-dreaming-pig.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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