Malicious PDF — malware analysis report

Static analysis result for SHA-256 978d454ce6f44892…

MALICIOUS

PDF

37.8 KB Created: 2020-04-07 10:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c0060932445346687abbd31dbe9b0f27 SHA-1: 49d95f3475bae403d46b4c287c73e1dbf3d76544 SHA-256: 978d454ce6f4489261d3081a8617549bd8b3cbd0811a4191cb14ce8c1bdf96d9
92 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDF documents hosted on unrelated domains. The heuristic 'PDF_SEO_LINK_FARM' strongly suggests this is a link farm designed to manipulate search engine rankings. The document body, though partially corrupted, contains a question about isomers and mentions wkhtmltopdf, indicating it was likely generated programmatically to host these links. The primary intent appears to be driving traffic to these external sites rather than delivering a direct exploit.

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://hyperion-ai.com/uploads/1/3/0/7/130740231/130740231.html#what+is+the+difference+between+constitutional+isomers+and+structural+isomers
    • http://thornhillscientific.com/uploads/1/3/0/8/130874592/e3d107e.pdf
    • http://mattahmann.com/uploads/1/3/0/7/130775655/5006000.pdf
    • http://mlvcomms.com/uploads/1/3/0/5/130540437/2059771.pdf
    • http://cajunclassique.com/uploads/1/3/1/4/131407012/xewajajejadaxisururi.pdf
    • http://vistawaycafe.com/uploads/1/3/0/6/130622091/3488511.pdf
    • http://hardingeducationresourcecenter.com/uploads/1/3/0/9/130969774/bef508fff380.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_off00006bd4.bin
565bd4952cdb363b5f8d5d5c881385c1158ad1faff9cc9197e5f84253ffd8459		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD4 7704 bytes

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