Malicious PDF — malware analysis report

Static analysis result for SHA-256 134c3c68aefb1e8f…

MALICIOUS

PDF

43.2 KB Created: 2019-03-17 10:22:38 +03:00 Authoring application: www.freepdfconvert.com (via http://www.freepdfconvert.com)
MD5: 3b66e9fbad0ddad8ebca0a9e1b98a932 SHA-1: a91a68f53a0cf5bb83db5ca198fcd6250a6d5944 SHA-256: 134c3c68aefb1e8fc524d6602d4aea161364bab169f3ec6093541674efaa56c6
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a critical heuristic for containing a mass external PDF link farm, with 32 links pointing to URLs on 'gorillawalker.com'. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure itself contains embedded URLs that are part of this link farm, suggesting an attempt to manipulate search engine results or redirect users to potentially malicious content. The primary attack pattern is likely Spearphishing Attachment, with the embedded links serving as the malicious payload delivery mechanism.

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/c-digo-de-pr-cticas-para-el-pescado-y-los.pdf
    • http://www.gorillawalker.com/50-weight-loss-juice-recipes-for-body-cleansing-lose-weight.pdf
    • http://www.gorillawalker.com/why-you-drink-and-how-to-stop-a-journey-to.pdf
    • http://www.gorillawalker.com/carpathia.pdf
    • http://www.gorillawalker.com/italian-cooking-authentic-regional-dishes-full-of-vibrant-flavors.pdf
    • http://www.gorillawalker.com/thunderbirds-the-vault.pdf
    • http://www.gorillawalker.com/cal-97-houston.pdf
    • http://www.gorillawalker.com/peru-highlights-bradt-travel-guides.pdf
    • http://www.gorillawalker.com/the-united-states-v-nixon-the-watergate-scandal-and-limits.pdf
    • http://www.gorillawalker.com/if-there-were-anywhere-but-desert-the-selected-poems-of.pdf
    • http://www.gorillawalker.com/2006-tibet-1-850-000-travel-map.pdf
    • http://www.gorillawalker.com/pensions-handbook-tolley-s-handbooks.pdf
    • http://www.gorillawalker.com/developing-effective-engineering-leadership-iee-management-of-technology-series-21.pdf
    • http://www.gorillawalker.com/rights-based-management-in-latin-american-fisheries-fao-fisheries-and.pdf
    • http://www.gorillawalker.com/termination-that-works-with-at-risk-children-and-adolescents-four.pdf
    • http://www.gorillawalker.com/the-marriage-book.pdf
    • http://www.gorillawalker.com/kwanzaa-the-seven-principles-gift-editions.pdf
    • http://www.gorillawalker.com/rumors-lies-and-whispers-classroom-crush-or-career-catastrophe.pdf
    • http://www.gorillawalker.com/let-s-go-with-the-children-in-south-west-devon.pdf
    • http://www.gorillawalker.com/5-steps-to-a-5-ap-world-history-2016-cross.pdf
    • http://www.gorillawalker.com/organizational-behavior-12th-edition-book-cd-rom.pdf
    • http://www.gorillawalker.com/coding-and-medicare-for-radiation-oncology.pdf
    • http://www.gorillawalker.com/how-to-differentiate-instruction-in-mixed-ability-classrooms-2nd-edition.pdf
    • http://www.gorillawalker.com/mass-transit-policy-planning.pdf
    • http://www.gorillawalker.com/black-lesbian-romance-friends-with-benefits-6-stories.pdf
    • http://www.gorillawalker.com/one-night-in-winter-a-novel-p-s.pdf
    • http://www.gorillawalker.com/zoo-animal-welfare.pdf
    • http://www.gorillawalker.com/assessment-of-existing-bridges-in-regions-of-moderate-seismicity.pdf
    • http://www.gorillawalker.com/absinthe-flamethrowers-projects-and-ruminations-on-the-art-of-living.pdf
    • http://www.gorillawalker.com/a-portrait-of-jaco-the-solos-collection.pdf
    • http://www.gorillawalker.com/apple-tv-user-guide-newbie-to-expert-in-1-hour.pdf
    • http://www.gorillawalker.com/the-tale-of-troy-puffin-classics-kindle-edition.pdf
    • http://www.gorillawalker.com/writer-s-reference-5e-with-2003-mla-update-and-cd.pdf
    • http://www.gorillawalker.com/adventures-in-paradise-missionary-memoirs-from-papua-new-guinea-kindle.pdf
    • http://www.gorillawalker.com/geography-middle-school-world-geography-student-one-stop-cd-rom.pdf
    • http://www.gorillawalker.com/devil-pumpkin-prophecy-devil-form-study-guide-7-kindle-edition.pdf
    • http://www.gorillawalker.com/the-yellow-book-a-parent-s-guide-to-sexuality-education.pdf
    • http://www.gorillawalker.com/every-cradle-is-a-grave-rethinking-the-ethics-of-birth.pdf
    • http://www.gorillawalker.com/hunter-travel-guides-adventure-guide-to-ireland-adventure-guides-series.pdf
    • http://www.gorillawalker.com/guide-to-free-campgrounds-includes-campgrounds-12-and-under-in.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://www.freepdfconvert.com
    • 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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