Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d6904f9a45db264…

MALICIOUS

PDF

43.7 KB Created: 2018-11-22 08:03:34 +03:00 Authoring application: LaTeX with hyperref package (via xdvipdfmx (0.7.8))
MD5: a5eaf2c33dec02ed5cb1bae388479e35 SHA-1: 2287bb29a6436a0724059fd6c06eadcfccbf536d SHA-256: 2d6904f9a45db264eeda37d869f43615be20aca8d0b690b63ae91e2d796994e5
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 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 from this sample, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8439

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/rocks-minerals-fossils-of-the-world.pdf
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    • http://www.gorillawalker.com/love-in-the-limelight-volume-one-star-of-his-heart.pdf
    • http://www.gorillawalker.com/we-re-just-like-you-only-prettier-confessions-of-a.pdf
    • http://www.gorillawalker.com/organic-syntheses-volume-67.pdf
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    • http://www.gorillawalker.com/cats-are-worthless.pdf
    • http://www.gorillawalker.com/schaum-s-outline-of-theory-and-problems-of-general-topology.pdf
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    • http://www.gorillawalker.com/introduction-to-theoretical-biology-a-theory-of-heat.pdf
    • http://www.gorillawalker.com/cleopatra-and-ancient-egypt-great-rulers.pdf
    • http://www.gorillawalker.com/sprich-mal-deutsch-bk-1.pdf
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    • http://www.gorillawalker.com/the-influence-of-the-arthurian-romances-on-the-five-books.pdf
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    • http://www.gorillawalker.com/property-insurance-some-points-to-consider-in-relation-to-the.pdf
    • 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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