Malicious PDF — malware analysis report

Static analysis result for SHA-256 612a04d0d0f555b2…

MALICIOUS

PDF

37.0 KB Created: 2020-04-16 10:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1b27c4c8c826569e74be9c1a50358f39 SHA-1: 657adda6733f5e944ceccfff9967eed3ae71be78 SHA-256: 612a04d0d0f555b28e05ded2e1992873ab6d131d42e8ce5416802e96e514ede7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many of which are structured as SEO-optimized PDF gateways. The document body, though partially corrupted, contains text related to 'car racing games 2018 free' and references the authoring application 'wkhtmltopdf', suggesting a lure to attract users to potentially malicious or spam content. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://blackfilmcentre.org/uploads/1/3/0/5/130542948/130542948.html#car+racing+games+2018+free
    • http://able2build.com/uploads/1/3/0/8/130814729/6341973.pdf
    • http://mystayathomejob.com/uploads/1/3/0/6/130620451/6685957.pdf
    • http://ouicoffeehouse.com/uploads/1/3/0/5/130539229/favevopix.pdf
    • http://crockersgrill.com/uploads/1/3/0/6/130639373/pawiwevu.pdf
    • http://desirapesta.us/uploads/1/3/0/7/130740510/280129.pdf
    • http://grindingthebean.org/uploads/1/3/1/3/131383973/gagisewekisile.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_off00006b34.bin
b5e9548e2e393e78a11d7e8c1ce3f68fdfadc2b8d7259251518bc5c983fd07b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B34 7520 bytes

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