Malicious PDF — malware analysis report

Static analysis result for SHA-256 3031cab1654b10f5…

MALICIOUS

PDF

42.7 KB Created: 2019-04-06 10:14:05 +03:00 Authoring application: FrameMaker 9.0 (via Acrobat Distiller 9.0.0 (Windows))
MD5: 7b2731ab95658a1a51975c83fc5e847b SHA-1: 021d970e00b2d5ed99d42576e13fbabbc3a65208 SHA-256: 3031cab1654b10f55103b018391e2bfa52848c2e891ca92380a53e2b1916f2e2
90 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9027

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/family-and-friends-6-workbook-6.pdf
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    • http://www.gorillawalker.com/dear-john.pdf
    • http://www.gorillawalker.com/metaphysics-books-b-and-k-1-2-clarendon-aristotle-series.pdf
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    • http://www.gorillawalker.com/brody-s-ghost-vol-2-paperback.pdf
    • http://www.gorillawalker.com/queen-arthur-futanari-erotica-fairy-tales-book-6-kindle-edition.pdf
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    • http://www.gorillawalker.com/the-chronicles-of-conan-volume-26-legion-of-the-dead.pdf
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    • http://www.gorillawalker.com/global-comparative-management-a-functional-appro
    • 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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