Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d835b6e270fde5e…

MALICIOUS

PDF

45.0 KB Created: 2019-03-17 10:45:17 +03:00 Authoring application: LaTeX with hyperref package (via pdfTeX-1.40.9)
MD5: a54f28d9eb2913f33a8eebdc560f96d1 SHA-1: 4c86b1e1c38fd01428d154576095f0cb2dd1e8e7 SHA-256: 6d835b6e270fde5e2ca11d519e19f0d938ee9ae2eba9c6c8fed1cdb205166fe3
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. The embedded URLs suggest an attempt to manipulate search engine results or to redirect users to potentially malicious content hosted on gorillawalker.com.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8812

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/algorithms-with-performance-guarantees-for-flow-shops-with-regular-objective.pdf
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    • http://www.gorillawalker.com/the-first-summer-people-the-thousand-islands-1650-1910.pdf
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    • http://www.gorillawalker.com/the-cio-paradox-battling-the-contradictions-of-it-leadership.pdf
    • http://www.gorillawalker.com/l-o-v-e-bert-kaempfert-milt-gabler-sab-sab.pdf
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    • http://www.gorillawalker.com/chemometrics-from-basics-to-wavelet-transform-chemical-analysis-a-series.pdf
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    • http://www.gorillawalker.com/the-physical-principles-of-electron-paramagnetic-resonance-frontiers-in-physics.pdf
    • http://www.gorillawalker.com/the-athletic-horse-pageburst-e-book-on-vitalsource-retail-access.pdf
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    • http://www.gorillawalker.com/portfolio-of-manufacturing-audits-company-self-assessment-audits.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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