Malicious PDF — malware analysis report

Static analysis result for SHA-256 411864beca4864aa…

MALICIOUS

PDF

37.2 KB Created: 2020-06-19 07:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cf48804ab0aa6c6bc2feb713730bbf2 SHA-1: 3bb4947510ad46e5c212a8f1fc5bb249922fb315 SHA-256: 411864beca4864aafc62494ab6419afe0e9bb71d2c31d2169953f7140d02493a
94 Risk Score

Malware Insights

MITRE ATT&CK
T1598 Gather Victim Identity Information T1204 Malicious Link

The PDF contains a large number of external links to various domains, identified by the PDF_SEO_LINK_FARM heuristic. The embedded document body also contains a prominent URL, suggesting a lure to external content. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to a network of linked PDFs, likely for SEO spam or to host further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://halfjack.com/uploads/1/3/0/7/130738845/130738845.html#blackburn+air+tower+4+manual
    • http://susansnellart.com/uploads/1/3/0/6/130639997/vutuvutevifij_wivobisobon_dasifovax.pdf
    • http://wishfork.com/uploads/1/3/0/5/130588839/d6735e.pdf
    • http://4oj.undesirable.us/uploads/1/3/1/8/131856112/worevukamiw_zenorurobupu_tetero.pdf
    • http://luismmojica.com/uploads/1/3/0/8/130813314/5c7134f8acc.pdf
    • http://bermudawellnessfestival.com/uploads/1/3/0/5/130551656/kijazimepovozes_xamub_dapurewegozat.pdf
    • http://coburnadam.com/uploads/1/3/1/8/131856356/kugisitin_bimatimun.pdf
    • http://mail.buildsmartgroup.com/uploads/1/3/0/4/130483795/8022983.pdf
    • http://autodiscover.margaretmorrisonhighlanddance.com/uploads/1/3/0/5/130545818/25e9323a46deeb3.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059c8.bin
6bc189ce82c155195437175e5ee943c0caba93be36c10772f40f8a9bbb7ceb52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59C8 5084 bytes
font_01_sfnt_off00006b0f.bin
ef8b1d83db953aa0420510aaafe9986ec22b3ce721f484f25cdc77b021986e1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B0F 8708 bytes

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