Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7df5e08150f0de…

MALICIOUS

PDF

40.0 KB Created: 2018-11-23 21:09:17 +03:00 Authoring application: LaTeX with hyperref package (via pdfTeX-1.40.4)
MD5: 775028aef5fafd4c648ca0a25f657ee3 SHA-1: 671e8350619c8fa7a55dbf9460f0cfd5f5a19314 SHA-256: cb7df5e08150f0de7467c1f5878822b930716f83fc27aa968d144c59c8a46656
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a critical heuristic for containing a mass external link farm, with 32 links pointing to various PDF files on the 'gorillawalker.com' domain. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains embedded URLs that are part of this link farm. This suggests the primary purpose is to manipulate search engine rankings or to serve as a distribution point for other malicious content.

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/pt-109-john-f-kennedy-in-ww-ii.pdf
    • http://www.gorillawalker.com/charlotte-hornets-pro-basketball-today.pdf
    • http://www.gorillawalker.com/pilates-on-the-ball-training-core-stability-for-a-healthy.pdf
    • http://www.gorillawalker.com/suzuki-lt80-quadrunner-and-quadsport-clymer-motorcycle-repair-series.pdf
    • http://www.gorillawalker.com/the-world-s-oddest-inventions-library-of-weird.pdf
    • http://www.gorillawalker.com/butterflies-on-the-roof-of-the-world-a-memoir.pdf
    • http://www.gorillawalker.com/how-we-survived-in-uhf-television-a-broadcasting-memoir-19531984.pdf
    • http://www.gorillawalker.com/i-am-a-gambler-with-nowhere-else-to-hide-a.pdf
    • http://www.gorillawalker.com/the-joy-of-music-in-maturity.pdf
    • http://www.gorillawalker.com/totally-amazing-mazes.pdf
    • http://www.gorillawalker.com/hooting-tooting-dinosaurs-dinosaur-train-little-golden-book.pdf
    • http://www.gorillawalker.com/jesus-the-daily-life-of-a-master-a-space-time.pdf
    • http://www.gorillawalker.com/database-processing-11th-edition.pdf
    • http://www.gorillawalker.com/the-moral-life-of-children.pdf
    • http://www.gorillawalker.com/after-virtue-a-study-in-moral-theory-second-edition.pdf
    • http://www.gorillawalker.com/taking-learning-to-task-creative-strategies-for-teaching-adults.pdf
    • http://www.gorillawalker.com/mia-a-matter-of-taste-cupcake-diaries.pdf
    • http://www.gorillawalker.com/the-derby-party-cooking-clinic-kindle-edition.pdf
    • http://www.gorillawalker.com/stop-talking-start-communicating-counterintuitive-secrets-to-success-in-business.pdf
    • http://www.gorillawalker.com/glencoe-speech-student-edition-ntc-speech-comm-matters.pdf
    • http://www.gorillawalker.com/odd-medical-cures-no-way.pdf
    • http://www.gorillawalker.com/volcano-when-a-mountain-explodes-high-five-reading.pdf
    • http://www.gorillawalker.com/houses-for-all-regions-cran-residential-collection.pdf
    • http://www.gorillawalker.com/changing-times-ireland-since-1898.pdf
    • http://www.gorillawalker.com/the-chief.pdf
    • http://www.gorillawalker.com/ace-your-firefighter-oral-boards-the-ultimate-guide-to-a.pdf
    • http://www.gorillawalker.com/ordination-in-societies-of-the-common-life-1958.pdf
    • http://www.gorillawalker.com/the-english-legal-system.pdf
    • http://www.gorillawalker.com/thermoeconomics-a-thermodynamic-approach-to-economics-third-edition.pdf
    • http://www.gorillawalker.com/sexual-integrity-workbook-a-sexual-revolution-called-purity.pdf
    • http://www.gorillawalker.com/science-for-common-entrance-biology-answers.pdf
    • http://www.gorillawalker.com/nigella-christmas-food-family-friends-festivities.pdf
    • http://www.gorillawalker.com/density-functional-theory-iv-theory-of-chemical-reactivity-topics-in.pdf
    • http://www.gorillawalker.com/enormous-crocodile.pdf
    • http://www.gorillawalker.com/dominic-ties-of-steel-volume-1.pdf
    • http://www.gorillawalker.com/singapore-favourites-kindle-edition.pdf
    • http://www.gorillawalker.com/flying-to-see-janet-a-fun-guide-to-the-airport.pdf
    • http://www.gorillawalker.com/popular-science-1947-november.pdf
    • http://www.gorillawalker.com/cameron-s-conservatives-and-the-internet-change-culture-and-cyber.pdf
    • http://www.gorillawalker.com/new-gcse-maths-edexcel-complete-revision-practice-higher-for-the.pdf
    • http://www.gorillawalker.com/how-we-survived-in-uhf-televi
    • 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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