Malicious PDF — malware analysis report

Static analysis result for SHA-256 a669c8fd2afd4e10…

MALICIOUS

PDF

40.4 KB Created: 2020-04-09 08:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b7402938fa10ca963b9322c8e3f340a8 SHA-1: 68b289563dac95d04e8e8528ffe3c31713306ea2 SHA-256: a669c8fd2afd4e10a0515b56ed675e29df1e38c64219475a8d2fd79ce8b4d36c
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a mass external PDF link farm, with 14 links pointing to various domains. The ML classifier strongly flagged this PDF as malicious. The document body contains garbled text but also includes a URL that is part of the link farm. The primary attack pattern appears to be SEO manipulation or distribution of malicious content via a large number of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://hippard.ca/uploads/1/3/1/3/131383737/131383737.html#todo+acerca+de+los+campos+de+concentracion
    • http://alliwantconference.net/uploads/1/3/1/0/131069893/7848433.pdf
    • http://secure-site.org/uploads/1/3/0/5/130543155/aa58d770720b.pdf
    • http://cloudcamfrog.com/uploads/1/3/0/3/130323216/9070ed0ee0b0.pdf
    • http://wonder77.com/uploads/1/3/0/5/130550667/2658636.pdf
    • http://thisisaprilriley.com/uploads/1/3/0/3/130313612/4664755.pdf
    • http://mallardip.com/uploads/1/3/0/8/130813420/251938.pdf
    • http://kenglishllc.com/uploads/1/3/0/7/130775107/665092.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_off000073a4.bin
c7c7d52c721a20732a859991aba50d0b87ce2ac1a4a36fb20f50e92edd2b79f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73A4 8752 bytes

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