Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1fee52d63f3990…

MALICIOUS

PDF

44.1 KB Created: 2019-01-06 08:09:44 +03:00 Authoring application: dvips(k) 5.993 Copyright 2013 Radical Eye Software (via GPL Ghostscript 9.07)
MD5: 9f81dc6015b497066c011192a6041382 SHA-1: 39966907f2c37cc8fe903b0f3296c77527f46404 SHA-256: 5f1fee52d63f3990436f88c5dd3415da730f215d98f84e633777a1664930dae1
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for a large number of external links, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent. The primary attack pattern appears to be distributing a large number of links to external PDF files hosted on 'gorillawalker.com'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9171

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/deep-cover-duty-honor-book-three.pdf
    • http://www.gorillawalker.com/sartre-a-life.pdf
    • http://www.gorillawalker.com/you-don-t-know-js-up-going.pdf
    • http://www.gorillawalker.com/tu-cuerpo-de-la-cabeza-a-los-pies-spanish-edition.pdf
    • http://www.gorillawalker.com/perspectives-in-modern-seismology-lecture-notes-in-earth-sciences.pdf
    • http://www.gorillawalker.com/modern-greece-a-history-since-1821.pdf
    • http://www.gorillawalker.com/the-american-film-industry-a-historical-dictionary.pdf
    • http://www.gorillawalker.com/human-stem-cell-technology-and-biology-a-research-guide-and.pdf
    • http://www.gorillawalker.com/jessica-blandy-18-le-contrat-jessica-french-edition.pdf
    • http://www.gorillawalker.com/osmos-magazine-issue-02.pdf
    • http://www.gorillawalker.com/ethics-of-medical-choice-social-change-in-western-europe.pdf
    • http://www.gorillawalker.com/the-backpacker-s-field-manual-a-comprehensive-guide-to-mastering.pdf
    • http://www.gorillawalker.com/report-of-lieut-j-w-abert-of-his-examination-of.pdf
    • http://www.gorillawalker.com/flowering-plants-willows-to-mustards-illustrated-flora-of-illinois.pdf
    • http://www.gorillawalker.com/child-exploitation-historical-overview-and-present-situation-data-statistics-perspectives.pdf
    • http://www.gorillawalker.com/the-everything-kids-easy-science-experiments-book-explore-the-world.pdf
    • http://www.gorillawalker.com/dictionary-of-african-historical-biography-second-edition-expanded-and-updated.pdf
    • http://www.gorillawalker.com/rodney-matthews-fantasy-calendar-1996.pdf
    • http://www.gorillawalker.com/long-long-war-voices-from-the-british-army-in-northern.pdf
    • http://www.gorillawalker.com/lima-plano-2000.pdf
    • http://www.gorillawalker.com/versprechen-sie-deutsch-fehlerverlernbuch-f-r-ausl-nder-neu-german.pdf
    • http://www.gorillawalker.com/sessions-tackle-growing-problem-of-overweight-among-u-s-kids.pdf
    • http://www.gorillawalker.com/assertion-training.pdf
    • http://www.gorillawalker.com/small-arms-survey-2014-women-and-guns.pdf
    • http://www.gorillawalker.com/always-watching-the-rayne-tour-kindle-edition.pdf
    • http://www.gorillawalker.com/open-mic-volume-five-kindle-edition.pdf
    • http://www.gorillawalker.com/film-induced-tourism-aspects-of-tourism.pdf
    • http://www.gorillawalker.com/there-s-nothing-in-this-book-that-i-meant-to.pdf
    • http://www.gorillawalker.com/italy-for-the-gourmet-traveler.pdf
    • http://www.gorillawalker.com/advice-to-doctors-and-other-big-people-from-kids.pdf
    • http://www.gorillawalker.com/18-natural-ways-to-look-and-feel-half-your-age.pdf
    • http://www.gorillawalker.com/simulation-modeling-methods-to-reduce-risks-and-increase-performance-cd.pdf
    • http://www.gorillawalker.com/elijah-s-ultimate-guide-to-tokyo-disneysea-2015-volume-1.pdf
    • http://www.gorillawalker.com/pipsqueaks-maze-party-read-with-me-cartwheel-books-scholastic-paperback.pdf
    • http://www.gorillawalker.com/word-wizard-dk-toys-games.pdf
    • http://www.gorillawalker.com/the-6-principles-to-6-pack-abs-kindle-edition.pdf
    • http://www.gorillawalker.com/the-household-doctor-describing-the-diagnosis-and-treatment-of-diseases.pdf
    • http://www.gorillawalker.com/in-defense-of-anarchism-author-robert-paul-wolff-published-on.pdf
    • http://www.gorillawalker.com/mcdougal-littell-concepts-skills-california-test-and-practice-workbook-grade.pdf
    • http://www.gorillawalker.com/charles-darwin-destroyer-of-myths-unabridged-audible-audio-edition.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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