Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44514819aac89ac…

MALICIOUS

PDF

34.2 KB Created: 2019-12-13 16:39:58 +03:00 Authoring application: PDFCreator Version 1.5.1 (via GPL Ghostscript 9.05)
MD5: e28e257df9aecabb1681585f9ff55b21 SHA-1: 3d84e67f6c2bead74cdc0f9b0dfd9268973674a6 SHA-256: a44514819aac89acba71a1224320331178f84102050594acfa147e6dc77cf50e
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 PDF link farm, with 32 links pointing to URLs on www.gorillawalker.com. The ML classifier also indicated a high probability of maliciousness. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the embedded links. The primary attack pattern appears to be SEO manipulation or the distribution of further malicious content via the numerous linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8015

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/futbol-252-ejercicios-de-portero-spanish-edition.pdf
    • http://www.gorillawalker.com/mountaineers-handbook.pdf
    • http://www.gorillawalker.com/poolside-pleasure.pdf
    • http://www.gorillawalker.com/der-richtige-lizenzvertrag-german-edition.pdf
    • http://www.gorillawalker.com/streets-de-miami-spanish-edition.pdf
    • http://www.gorillawalker.com/ancient-greece-understanding-world-history-reference-point.pdf
    • http://www.gorillawalker.com/if-i-knew-then-what-i-know-now-youth-workers.pdf
    • http://www.gorillawalker.com/bad-kitty-goes-to-the-vet.pdf
    • http://www.gorillawalker.com/top-ten-tips-a-survival-guide-for-families-with-children.pdf
    • http://www.gorillawalker.com/a-world-history-of-architecture-1st-ed.pdf
    • http://www.gorillawalker.com/time-global-warming.pdf
    • http://www.gorillawalker.com/football-s-quick-passing-game-volume-3-implementing-the-package.pdf
    • http://www.gorillawalker.com/the-people-s-almanac-presents-the-book-of-lists.pdf
    • http://www.gorillawalker.com/antropologia-e-historia-de-los-mixe-zoques-y-mayas-homenaje.pdf
    • http://www.gorillawalker.com/hidden-in-the-mix-the-african-american-presence-in-country.pdf
    • http://www.gorillawalker.com/the-drama-of-john-marston-critical-re-visions.pdf
    • http://www.gorillawalker.com/endometriosis-your-sexual-health.pdf
    • http://www.gorillawalker.com/the-wiersbe-bible-study-series-jeremiah-taking-a-stand-for.pdf
    • http://www.gorillawalker.com/the-path-of-souls-transcendance-trilogy-book-1-kindle-edition.pdf
    • http://www.gorillawalker.com/in-my-pocket.pdf
    • http://www.gorillawalker.com/through-corridors-of-power-institutions-and-civil-military-relations-in.pdf
    • http://www.gorillawalker.com/cnet-do-it-yourself-digital-home-office-projects-24-cool.pdf
    • http://www.gorillawalker.com/how-to-make-a-great-soy-jar-candle-revealing-my.pdf
    • http://www.gorillawalker.com/how-to-rebuild-the-small-block-chevrolet-revised-s-a.pdf
    • http://www.gorillawalker.com/midnight-lover-the-vampire-series-book-5.pdf
    • http://www.gorillawalker.com/optoelectronics-10-world-of-electronic-basis-korean-edition.pdf
    • http://www.gorillawalker.com/the-devil-knows-how-to-ride-the-true-story-of.pdf
    • http://www.gorillawalker.com/the-return-of-the-serpents-of-wisdom.pdf
    • http://www.gorillawalker.com/introductory-statistics-plus-mystatlab-with-pearson-etext-access-card-package.pdf
    • http://www.gorillawalker.com/the-best-management-resources-devloping-management-skills-a-self-directed.pdf
    • http://www.gorillawalker.com/the-edge-of-never-a-skier-s-story-of-life.pdf
    • http://www.gorillawalker.com/blizzard-of-glass-the-halifax-explosion-of-1917.pdf
    • http://www.gorillawalker.com/structural-geology-of-the-santa-rita-mountains-southeast-of-tucson.pdf
    • http://www.gorillawalker.com/the-continental-shelf-and-the-exclusive-economic-zone-le-plateau.pdf
    • http://www.gorillawalker.com/believe-god-146-s-son-god-rocks-bibletoons-153.pdf
    • http://www.gorillawalker.com/handbook-of-optimization-in-medicine-springer-optimization-and-its-applications.pdf
    • http://www.gorillawalker.com/gospel-of-sufferings.pdf
    • http://www.gorillawalker.com/the-lure-of-the-honeybird-the-storytellers-of-ethiopia.pdf
    • http://www.gorillawalker.com/transforma-tu-vida-transform-your-life-un-viaje-gozoso-spanish.pdf
    • http://www.gorillawalker.com/podstawy-stochastycznej-dynamiki-konstrukcji-fundamentals-of-stochastic-structural-dynamics.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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