Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b017fb3109eb345…

MALICIOUS

PDF

40.8 KB Created: 2020-04-10 11:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 396726178c3bb2b1ca179116f86b081a SHA-1: 738c02fe00c2d0cb82d7eeff265acbce0e41a557 SHA-256: 4b017fb3109eb345f97a06d240c5ff54a6274872f0ae93c9073b819089ae839d
94 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains associated with SEO link farms, suggesting a malicious intent to redirect users. The document body mentions 'Windows 7 error 8000ffff', which is a common lure for technical support scams or phishing attempts. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack pattern involves redirecting users to external sites, likely for credential harvesting or further malware distribution.

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://305credithelp.org/uploads/1/3/0/6/130604419/130604419.html#windows+7+error+8000ffff
    • http://feloniesunited.org/uploads/1/3/1/0/131069893/jenasezamumokodele.pdf
    • http://lcpsociety.com/uploads/1/3/1/4/131438825/rofosuwuvogiboxi.pdf
    • http://preacherjoe.com/uploads/1/3/0/9/130969754/b12f84eb5d770b.pdf
    • http://fullcircleexpression.com/uploads/1/3/0/5/130551219/fawibazejemafuwome.pdf
    • http://thinkingsnotillegal.com/uploads/1/3/0/7/130775878/xavovibowagesuxaz.pdf
    • http://thegodsquad.info/uploads/1/3/1/6/131606331/rejopome.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_off000074a7.bin
b14de2eb420eb940d4f816d996df26aad9445a3e9004c6804116c07ef152ed21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74A7 9092 bytes

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