Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7e619a05ee0f6c…

MALICIOUS

PDF

43.5 KB Created: 2019-02-14 08:12:14 +03:00 Authoring application: FrameMaker 9.0 (via Acrobat Distiller 8.0.0 (Windows))
MD5: 936fef97723521104f80dc588669df01 SHA-1: fdad973ba2466ab3fa5a08dc3dab5b40b7807540 SHA-256: 8b7e619a05ee0f6c5054b884226dba1ebbff4d3dcaa1afe4e86f24cc2f26baeb
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment

The PDF contains a large number of embedded links pointing to external PDF files, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier also flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8683

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/a-terrible-beauty-poetry-of-1916.pdf
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    • http://www.gorillawalker.com/thinking-in-physics-the-pleas
    • 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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