Malicious PDF — malware analysis report

Static analysis result for SHA-256 934d4f54155dfe8c…

MALICIOUS

PDF

84.1 KB Created: 2020-04-19 09:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: da5945b82baa893e32f1c5c70683d707 SHA-1: ed1ee87faa3b259f20db36df0688fe161a5fde50 SHA-256: 934d4f54155dfe8c38b0dd0d3d14266ab854dbbfa7a319ab49d9257782644220
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on various domains, indicating a link farm or SEO spam tactic. The document body, though heavily obfuscated, contains a reference to 'Google data studio' and 'wkhtmltopdf', suggesting a lure to a fake report. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bridgestreampublishing.com/uploads/1/3/0/7/130740442/130740442.html#google+data+studio
    • http://kaycosbyinteriors.com/uploads/1/3/1/3/131379183/2763291.pdf
    • http://lockdown-lockout.com/uploads/1/3/1/4/131453679/3745363.pdf
    • http://bmwalkerenterprises.com/uploads/1/3/0/7/130775012/2897922.pdf
    • http://racquetballtim.com/uploads/1/3/0/4/130476844/gekofoxutixofug-lesaloge-funevixazoxupin.pdf
    • http://clevelandweddingvr.com/uploads/1/3/0/5/130588299/3270113.pdf
    • http://fivefiguremonthly.com/uploads/1/3/1/3/131379021/d5f95409285.pdf
    • http://mimsmemoryquilts.com/uploads/1/3/0/8/130813961/e7b30.pdf
    • http://sisirmishra.com/uploads/1/3/0/6/130620795/1575432.pdf
    • http://grossmontorthotech.com/uploads/1/3/0/8/130874455/kalusutabi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066c1.bin
96d8c4805142c4a2862e49bf3cd6f7e787d624393e0e3baccdec392670de04d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66C1 8276 bytes
font_01_sfnt_off000085d2.bin
0081876ec1044127ec189ac384b77be109e9860fb2fdf7676bf715c5344c037e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85D2 56984 bytes
font_02_sfnt_off00012f2d.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2D 16036 bytes

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