Malicious PDF — malware analysis report

Static analysis result for SHA-256 b149ce5131376ff0…

MALICIOUS

PDF

57.2 KB Created: 2020-04-22 01:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 000ae93e16cda51f1ac2c6ef002600a1 SHA-1: d6c5699ab27dd7a71bbab7a004d13a165b885eb1 SHA-256: b149ce5131376ff0a7d37f1907288f443800de23d4cc35497e4f0f29fa70da04
92 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common technique for SEO poisoning and driving traffic to malicious sites. The document body, though heavily obfuscated, contains text related to medical treatment guidelines, likely serving as a lure. The heuristic 'PDF_SEO_LINK_FARM' strongly indicates this is part of a link farm designed to manipulate search engine results and direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://noheaskitchen.com/uploads/1/3/1/3/131379833/131379833.html#transient+ischemic+attack+treatment+guidelines
    • http://wickedricks.com/uploads/1/3/0/6/130620337/140db.pdf
    • http://supergcoating.com/uploads/1/3/1/3/131382133/fewobaxivosej.pdf
    • http://beyond-bookkeeping.com/uploads/1/3/0/6/130639068/792a4045217b69.pdf
    • http://toyota-tacoma2004.com/uploads/1/3/0/6/130603997/fakelusiv.pdf
    • http://eventheque.net/uploads/1/3/0/5/130546432/8812247.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_off0000b500.bin
8517344b3fb9c09814bb2b0d2f564d97640ea8d5798711bccfb2712d4a4783fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB500 9952 bytes

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