Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b93a8bd4cb20d4…

MALICIOUS

PDF

55.0 KB Created: 2020-04-15 01:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a1d8fd1a344ad66c53efaf4d1f642f0d SHA-1: 222f35ad110a9253044e9ecb70c26e99f4d8fee9 SHA-256: f6b93a8bd4cb20d43ea9b8e0e3023d7db2f1f71afa7020f76cc8463627117152
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to unrelated domains and appear to be part of a link farm. The document body contains garbled text and a reference to 'wkhtmltopdf', suggesting it was generated programmatically. The primary heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, and the ML classifier strongly flagged this PDF as malicious. The linked URLs are likely used to redirect users to malicious sites or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://mnguidedgoosehunting.com/uploads/1/3/0/6/130603937/130603937.html#witty+answer+to+who+are+you
    • http://eightynineties.com/uploads/1/3/1/4/131453494/tedodabibu-wejofi-keloka-watow.pdf
    • http://leogarzaproperties.com/uploads/1/3/0/6/130621257/desisibo.pdf
    • http://ganjamomma.com/uploads/1/3/0/6/130604646/6f9511f53c.pdf
    • http://mickeylawyer.com/uploads/1/3/0/6/130620928/sedenafazas.pdf
    • http://kbgiftnmore.com/uploads/1/3/1/3/131380171/kolametavora_vudunipabenuv_xetig.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000977d.bin
d1adce5890b4074f3cb0875572cda9457ee1dd7c542bd1ce888f43ad1684f4d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x977D 8728 bytes
font_01_sfnt_off0000b8ce.bin
1d1fa5121415f8f5353993473374918b9d2a38f433752094af4cce5d3be72c8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CE 16312 bytes

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