Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb6ca7af36568ac…

MALICIOUS

PDF

43.2 KB Created: 2020-04-15 08:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9825d2b4a8d9ad6cd938208eed3deea8 SHA-1: 2b0142b3385854d097efdc4f6a54ce689c67170f SHA-256: acb6ca7af36568acbb847587180ac29716201f53d6bc63130370c41a252a2195
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many pointing to similarly structured URLs on various domains, indicating a link farm or SEO spam tactic. The document body text, though garbled, contains keywords related to 'video making software for android mobile' and references the wkhtmltopdf tool, suggesting a lure to potentially malicious content hosted on these external sites. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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
  • 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://shawngraphic.com/uploads/1/3/0/7/130775265/130775265.html#video+making+software+for+android+mobile
    • http://structuralcolordesign.com/uploads/1/3/0/7/130776296/giwidapaxetalor.pdf
    • http://chefrobotics.com/uploads/1/3/0/5/130539225/8abd4a2a9fe8.pdf
    • http://faroutpaints.org/uploads/1/3/0/3/130323406/408768.pdf
    • http://thegoddessdiaries.org/uploads/1/3/0/8/130874077/pigekobapoja-mataganutape-numeko-xewuxubobizi.pdf
    • http://vandenbossracing.com/uploads/1/3/1/3/131384335/16cf35c9f84.pdf
    • http://usaunitedfoundation.com/uploads/1/3/1/3/131383591/xitilewapakesafu.pdf
    • http://boomcars.de/uploads/1/3/0/9/130968995/e080098ff78.pdf
    • http://selenamclaughin.com/uploads/1/3/0/3/130313158/f3cf8c442.pdf
    • http://marciaoford.com/uploads/1/3/1/3/131382032/0e1909dd78.pdf
    • http://littleforest.ca/uploads/1/3/0/4/130488619/5876998.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081c1.bin
035aefed8aad78fb014fefad41877ee9b643700b75794f3e6066c1acdb4f1e92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81C1 7984 bytes

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