Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8a07fdcba81d9f…

MALICIOUS

PDF

41.5 KB Created: 2018-12-05 08:14:02 +03:00 Authoring application: QuarkXPress¢â: LaserWriter 8 KH-8.7.1 (via Acrobat Distiller 4.05 for Macintosh)
MD5: 709a737276ac6d279f7935f1582fa9f5 SHA-1: 4d7d695078397516888b5ce22ecd1719b602a0ea SHA-256: da8a07fdcba81d9f0154a59059a66f112f8ffd76abf65f9567cc3a6b1d744307
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment

The PDF_SEO_LINK_FARM heuristic indicates the presence of a large number of external links within the document, suggesting a malicious intent related to link farming or content distribution. The ML classifier also flagged the PDF as malicious with high confidence. No scripts were extracted, and the document body contained mostly obfuscated or binary data, making it difficult to ascertain the exact user-facing lure. The primary IOCs are the numerous URLs hosted on www.gorillawalker.com.

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/the-gothic-war.pdf
    • http://www.gorillawalker.com/the-yucky-reptile-alphabet-book.pdf
    • http://www.gorillawalker.com/the-wisden-papers-1947-68.pdf
    • http://www.gorillawalker.com/statistics-for-chemical-and-process-engineers-a-modern-approach.pdf
    • http://www.gorillawalker.com/the-violence-against-women-act-elements-and-considerations-criminal-justice.pdf
    • http://www.gorillawalker.com/how-to-restore-volkswagen-bay-window-bus-enthusiast-s-restoration.pdf
    • http://www.gorillawalker.com/the-eye-care-revolution-prevent-and-reverse-common-vision-problems.pdf
    • http://www.gorillawalker.com/table-of-integrals-series-and-products-fifth-edition.pdf
    • http://www.gorillawalker.com/a-genealogist-s-guide-to-richmond-virginia-kindle-edition.pdf
    • http://www.gorillawalker.com/vocabulearn-italian-complete-vocabulearn-r-italian-edition.pdf
    • http://www.gorillawalker.com/the-art-of-decision-making.pdf
    • http://www.gorillawalker.com/the-gospel-of-luke-2nd-ed-ignatius-catholic-study-bible.pdf
    • http://www.gorillawalker.com/programm-ejercicios-aleman-para-hispanohablantes-spanish-edition.pdf
    • http://www.gorillawalker.com/yoga-girl-finding-happiness-cultivating-balance-and-living-with-your.pdf
    • http://www.gorillawalker.com/eyewitness-to-power-the-essence-of-leadership-nixon-to-clinton.pdf
    • http://www.gorillawalker.com/see-beyond-kindle-edition.pdf
    • http://www.gorillawalker.com/perception-second-edition.pdf
    • http://www.gorillawalker.com/the-promise-of-amida-buddha-honen-s-path-to-bliss.pdf
    • http://www.gorillawalker.com/kierkegaard-and-the-philosophy-of-love.pdf
    • http://www.gorillawalker.com/skull-moon.pdf
    • http://www.gorillawalker.com/trinity-darkness-revealed-3-ascent.pdf
    • http://www.gorillawalker.com/concerto-corrected-revised-version-violin-and-piano-reduction.pdf
    • http://www.gorillawalker.com/autocourse-cart-world-series-1997-98-autocourse-cart-official-champ.pdf
    • http://www.gorillawalker.com/rhythm-and-beauty.pdf
    • http://www.gorillawalker.com/royal-family-paper-dolls.pdf
    • http://www.gorillawalker.com/giulia-una-donna-fra-due-papi-secondo-millennio-italian-edition.pdf
    • http://www.gorillawalker.com/game-theory-and-the-environment.pdf
    • http://www.gorillawalker.com/introduction-to-business-english-mail-for-outsourcing-2010-isbn-4274208931.pdf
    • http://www.gorillawalker.com/nelson-international-mathematics-2nd-edition-student-book-4.pdf
    • http://www.gorillawalker.com/clavichord-for-beginners-publications-of-the-early-music-institute.pdf
    • http://www.gorillawalker.com/children-violence-murder-crime-justice-punishment.pdf
    • http://www.gorillawalker.com/a-separate-peace-sparknotes-literature-guide-sparknotes-literature-guide-series.pdf
    • http://www.gorillawalker.com/blood-and-water-the-indus-river-basin-in-modern-history.pdf
    • http://www.gorillawalker.com/are-you-a-frog.pdf
    • http://www.gorillawalker.com/foundation-and-anchor-design-guide-for-metal-building-systems-kindle.pdf
    • http://www.gorillawalker.com/giving-it-up-for-lent-workbook-bible-study-drama-discussion.pdf
    • http://www.gorillawalker.com/daily-warm-ups-math-grade-6.pdf
    • http://www.gorillawalker.com/engineering-design-graphics-with-autodesk-inventor-2012.pdf
    • http://www.gorillawalker.com/successful-new-employee-orientation-a-step-by-step-guide-for.pdf
    • http://www.gorillawalker.com/the-surface-volume-1.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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