Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d3d71c3cf2d0c2…

MALICIOUS

PDF

40.5 KB Created: 2018-11-30 20:09:12 +03:00 Authoring application: Word 10.0 (via AFPL Ghostscript 8.13)
MD5: 30bb1158fb50e1cf22a65a7ca85281c5 SHA-1: 0999ab5c1833b872a61e5b3732acd1e510239454 SHA-256: a8d3d71c3cf2d0c22eb27e6b23b20b966b2ce06865eed0664982edf7f2b3fdc6
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link

The PDF contains a large number of embedded links to other PDF files hosted on www.gorillawalker.com. This behavior is indicative of a PDF_SEO_LINK_FARM heuristic firing, suggesting the document is part of a scheme to manipulate search engine results or distribute content. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9181

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/title-woman-and-labour.pdf
    • http://www.gorillawalker.com/the-last-ship-a-novel.pdf
    • http://www.gorillawalker.com/mechanics-of-composite-materials-second-edition-mechanical-and-aerospace-engineering.pdf
    • http://www.gorillawalker.com/biochimica-industriale-enzimi-e-loro-applicazioni-nella-bioindustria-italian-edition.pdf
    • http://www.gorillawalker.com/nova-nephilim-code-book-1-kindle-edition.pdf
    • http://www.gorillawalker.com/carving-gunstocks-power-techniques.pdf
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    • http://www.gorillawalker.com/by-j-david-spiceland-financial-accounting-3rd-edition-6-10.pdf
    • http://www.gorillawalker.com/two-worlds-one-art-literary-translation-in-russia-and-america.pdf
    • http://www.gorillawalker.com/inteligencia-la-respuesta-creativa-al-ahora-spanish-edition.pdf
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    • http://www.gorillawalker.com/the-professional-stranger-an-informal-introduction-to-ethnography.pdf
    • http://www.gorillawalker.com/fundamentals-of-global-positioning-system-receivers-a-software-approach.pdf
    • http://www.gorillawalker.com/greek-mathematical-thought-and-the-origin-of-algebra-dover-books.pdf
    • http://www.gorillawalker.com/el-arte-de-la-paz-spanish-edition.pdf
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    • http://www.gorillawalker.com/the-olympics-50-craziest-stories.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/