Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17c90073c595f43…

MALICIOUS

PDF

29.7 KB Created: 2020-06-01 22:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d456d6bb4076bd45b1df721cb5ecab89 SHA-1: 5903edc5cf89af3f7a8684eb4038af2804e63d25 SHA-256: c17c90073c595f43e658a1116bd0ad5e1acba30c83504c0bf188dd7f36f22957
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains text related to 'Killing floor 2 prestige skins' and references to wkhtmltopdf, suggesting a lure. The primary purpose appears to be directing users to a network of websites, likely to host more malicious content or engage in SEO abuse. The ML classifier strongly supports the malicious nature of this PDF.

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://gatheringnations.org/uploads/1/3/1/4/131407226/131407226.html#killing+floor+2+prestige+skins
    • http://slpwaboard.org/uploads/1/3/1/3/131379168/1356519.pdf
    • http://sunrisestudiosdesign.com/uploads/1/3/0/7/130775556/9e05eaf50fc6.pdf
    • http://customcleancarpets.com/uploads/1/3/1/3/131380065/45c68385.pdf
    • http://mail.apct.fr/uploads/1/3/0/5/130588150/4680843ed732861.pdf
    • http://gatheringnations.org/uploads/1/3/1/4/131407226/terms.html
    • http://gatheringnations.org/uploads/1/3/1/4/131407226/dmca.html
    • http://gatheringnations.org/uploads/1/3/1/4/131407226/policy.html
    • https://vasoponox.files.wordpress.com/2020/05/sigud.pdf
    • https://daritawaba.files.wordpress.com/2020/05/22425277555.pdf
    • https://xilogip.files.wordpress.com/2020/05/6237644325.pdf
    • https://gokidomaj.files.wordpress.com/2020/05/97783074247.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_off0000498a.bin
3458fe5d0a0135a0753b7d44d4706f7726637a552228b3fb57caa825f2da1bdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x498A 9984 bytes

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