Malicious PDF — malware analysis report

Static analysis result for SHA-256 557d40a96423c8bd…

MALICIOUS

PDF

42.8 KB Created: 2019-03-18 06:17:27 +03:00 Authoring application: AH Formatter V5.3 MR1 for Windows (via Acrobat Distiller 8.1.0 (Windows))
MD5: 99e0b77ba3ccfb45706fc3f1e2aff395 SHA-1: b55857cc2a473c804eac839bb8f46f9c4de35e9d SHA-256: 557d40a96423c8bd6af9a2b2c99a52014afff3448a253aa2c89ea23f78690c1a
90 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files on the domain gorillawalker.com. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ML classifier also flagged this PDF as malicious, supporting the suspicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8872

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/maripasoula-french-guiana-overseas-maps.pdf
    • http://www.gorillawalker.com/around-the-world-in-a-hundred-years.pdf
    • http://www.gorillawalker.com/the-audio-recording-handbook-computer-music-and-digital-audio-series.pdf
    • http://www.gorillawalker.com/the-queen-alone-chronicles-of-the-tempus.pdf
    • http://www.gorillawalker.com/a-world-of-gangs-armed-young-men-and-gangsta-culture.pdf
    • http://www.gorillawalker.com/new-horizons-in-pro-p-groups-progress-in-mathematics.pdf
    • http://www.gorillawalker.com/god-and-his-demons.pdf
    • http://www.gorillawalker.com/action-research-a-guide-for-the-teacher-researcher-4th-edition.pdf
    • http://www.gorillawalker.com/phantorgasm.pdf
    • http://www.gorillawalker.com/the-king-s-curse-cousins-war-series-book-6.pdf
    • http://www.gorillawalker.com/mawson-and-the-ice-men-of-the-heroic-age-scott.pdf
    • http://www.gorillawalker.com/john-l-stoddard-s-lectures-supplementary-volume-1-ireland-i.pdf
    • http://www.gorillawalker.com/fiji-a-travel-survival-kit.pdf
    • http://www.gorillawalker.com/proceedings-of-the-36th-international-conference-on-advanced-ceramics-and.pdf
    • http://www.gorillawalker.com/music-in-theory-and-practice-vol-2.pdf
    • http://www.gorillawalker.com/codemaster-seismic-design-category-2006-ibc-asce-7-05.pdf
    • http://www.gorillawalker.com/graphic-design-manual-principles-and-practice.pdf
    • http://www.gorillawalker.com/the-forgetting-alzheimer-s-portrait-of-an-epidemic-1st-first.pdf
    • http://www.gorillawalker.com/chasing-jillian-a-love-and-football-novel.pdf
    • http://www.gorillawalker.com/ben-und-gwen-spielen-das-spiel-der-gegenteile-ben-and.pdf
    • http://www.gorillawalker.com/engelsk-grammatik-norwegian-edition.pdf
    • http://www.gorillawalker.com/procrastination-and-task-avoidance-theory-research-and-treatment-the-springer.pdf
    • http://www.gorillawalker.com/to-the-limit-of-endurance-a-battalion-of-marines-in.pdf
    • http://www.gorillawalker.com/peter-norton-s-new-inside-the-pc.pdf
    • http://www.gorillawalker.com/a-cowboy-s-redemption-cowboys-of-the-rio-grande-kindle.pdf
    • http://www.gorillawalker.com/dreams-of-the-red-phoenix.pdf
    • http://www.gorillawalker.com/the-king-s-concubine-historical-first-time-pregnancy.pdf
    • http://www.gorillawalker.com/pawns-in-the-dark.pdf
    • http://www.gorillawalker.com/iml-farm-ranch-business-mgmt.pdf
    • http://www.gorillawalker.com/poems-about-horses-everyman-s-library-pocket-poets.pdf
    • http://www.gorillawalker.com/dora-s-bedtime-adventures-dora-the-explorer.pdf
    • http://www.gorillawalker.com/ridley-road.pdf
    • http://www.gorillawalker.com/the-inner-athlete-realizing-your-fullest-potential.pdf
    • http://www.gorillawalker.com/potter-s-atlas-of-fetal-and-infant-pathology-1e.pdf
    • http://www.gorillawalker.com/new-york-sightseeing-buses-1996-2000-colourscene-snapshot.pdf
    • http://www.gorillawalker.com/sax-s-dangerous-properties-of-industrial-materials-5-volume-set.pdf
    • http://www.gorillawalker.com/hardcore-history-the-extremely-uncensored-history-of-ecw-paperback.pdf
    • http://www.gorillawalker.com/make-your-own-model-my-house.pdf
    • http://www.gorillawalker.com/in-the-doctor-s-bed-harlequin-kimani-romance-hopewell-genera.pdf
    • http://www.gorillawalker.com/warrior-the-war-chronicles-i.pdf
    • http://www.gorillawalker.com/action-research-a-guide-for-the-teacher-researcher-4th-edit
    • 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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