Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a44cf4d92cedb4…

MALICIOUS

PDF

41.7 KB Created: 2018-12-07 18:27:52 +03:00 Authoring application: - (via GNU Ghostscript 6.53)
MD5: 21b857b29b7ca338f4ab9f2be8dbf865 SHA-1: 858e5fb6c799e0dff021b3e3a0df7d1796dbbcfa SHA-256: a9a44cf4d92cedb4ccc1c18740ba56749bf847f35f22efeab5e82d710c40fd14
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged by a machine learning classifier and contains a large number of embedded URLs pointing to external PDF files. This suggests a link farm or SEO manipulation tactic. The primary attack pattern involves distributing numerous links, likely to spread malicious content or manipulate search engine rankings. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8872

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/beginning.pdf
    • http://www.gorillawalker.com/introduction-to-multicultural-counseling-for-helping-professionals.pdf
    • http://www.gorillawalker.com/chronic-obstructive-pulmonary-disease-copd-executive-market-summary-2011-download.pdf
    • http://www.gorillawalker.com/body-piercing-the-body-art-manual-by-quarto-publishing-paperback.pdf
    • http://www.gorillawalker.com/environmental-economics-in-theory-practice-second-edition.pdf
    • http://www.gorillawalker.com/send-out-your-spirit-sponsor-s-handbook.pdf
    • http://www.gorillawalker.com/how-i-cured-myself-of-hepatitis-b.pdf
    • http://www.gorillawalker.com/material-girl-2.pdf
    • http://www.gorillawalker.com/the-great-sea-a-human-history-of-the-mediterranean.pdf
    • http://www.gorillawalker.com/confessions-an-honest-male-perspective-on-issues-concerning-manhood-and.pdf
    • http://www.gorillawalker.com/texes-business-education-6-12-176-secrets-study-guide-texes.pdf
    • http://www.gorillawalker.com/sing-we-noel-medley-ssa.pdf
    • http://www.gorillawalker.com/the-five-wounds-sanctuary-for-the-sick-balm-for-the.pdf
    • http://www.gorillawalker.com/employee-surveys-in-management-theories-tools-and-practical-applications.pdf
    • http://www.gorillawalker.com/indonesia-a-travel-portrait.pdf
    • http://www.gorillawalker.com/horticulture-for-a-greener-world-l-ron-hubbard-series-horticulture.pdf
    • http://www.gorillawalker.com/the-physician-s-tale.pdf
    • http://www.gorillawalker.com/elemental-magick-paperback.pdf
    • http://www.gorillawalker.com/otters-welcome-to-the-world-of.pdf
    • http://www.gorillawalker.com/the-times-extreme-survivors-60-of-the-world-s-most.pdf
    • http://www.gorillawalker.com/the-motorway-achievement-volume-1-visualisation-of-the-british-motorway.pdf
    • http://www.gorillawalker.com/lighthouse-year-1-p2-blue-sports-dictionary-6-pack.pdf
    • http://www.gorillawalker.com/blackshirts-in-devon.pdf
    • http://www.gorillawalker.com/a-commentary-on-horace-odes-book-iii.pdf
    • http://www.gorillawalker.com/the-berenstain-bears-valentine-blessings-berenstain-bears-living-lights.pdf
    • http://www.gorillawalker.com/bits-and-pieces.pdf
    • http://www.gorillawalker.com/rediscovering-the-book-of-mormon.pdf
    • http://www.gorillawalker.com/algerie-le-passe-revisite-french-edition.pdf
    • http://www.gorillawalker.com/mr-hemphill.pdf
    • http://www.gorillawalker.com/us-army-technical-manual-tm-5-6675-270-25p-theodolite.pdf
    • http://www.gorillawalker.com/breaking-free-a-recovery-workbook-for-facing-codependence.pdf
    • http://www.gorillawalker.com/real-men-eat-puffer-fish-and-93-other-dangerous-things.pdf
    • http://www.gorillawalker.com/export-import-procedures-and-documentation-kindle-edition.pdf
    • http://www.gorillawalker.com/surface-modification-and-mechanisms-friction-stress-and-reaction-engineering.pdf
    • http://www.gorillawalker.com/large-scale-interactive-fuzzy-multiobjective-programming-decomposition-approaches-studies-in.pdf
    • http://www.gorillawalker.com/ahead-of-her-time-in-yesteryear-geraldyne-pierce-zimmerman-comes.pdf
    • http://www.gorillawalker.com/flying-insects-and-robots.pdf
    • http://www.gorillawalker.com/pruebas-psicotecnicas-spanish-edition.pdf
    • http://www.gorillawalker.com/eugene-onegin-vocal-score.pdf
    • http://www.gorillawalker.com/really-short-walks-south-devon.pdf
    • http://www.gorillawalker.com/confessi
    • 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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