Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b2ca212a671959…

MALICIOUS

PDF

42.2 KB Created: 2018-11-30 20:23:52 +03:00 Authoring application: TeX (via pdfTeX-1.40.17)
MD5: 5265c57642bf722d09642daa386a35af SHA-1: 8a6b08e4db8dcdaae8dcf4902a1cb790c9e41b4f SHA-256: d1b2ca212a671959a3cb605cf2c95fcfb26192e21b2e1b0cfb6bf3070753c0ff
90 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links 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. No scripts were extracted from this sample, and the document body was heavily obfuscated, making it difficult to determine a more specific attack pattern beyond the link farm.

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/krakow-aa-citypack-guides.pdf
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    • http://www.gorillawalker.com/banshee-s-honor.pdf
    • http://www.gorillawalker.com/smack-spanking-drawings-and-illustrations-erotic-art-classics-book-1.pdf
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    • http://www.gorillawalker.com/the-complete-acoa-sourcebook-adult-children-of-alcoholics-at-home.pdf
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    • http://www.gorillawalker.com/smack-spanking-drawings-and-illustrations-erotic-art-clas
    • 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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