Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79fb9bc11152d43…

MALICIOUS

PDF

52.2 KB Created: 2020-04-25 20:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a180240b6cf4fb39640b97309643a278 SHA-1: 188df7678d967b5ca1fb08d7b2c73135316f05eb SHA-256: a79fb9bc11152d43aac7f0c882ed8a1cedb744b164e164c2709a53df92b623e4
92 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, specifically for containing a large number of external links designed to appear as a link farm. The document body contains obfuscated text and references to 'vsco filters apk ios', suggesting a lure for potentially unwanted applications or further malicious content. The primary attack pattern involves directing users to a network of suspicious URLs hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://luke-jones.com/uploads/1/3/0/2/130272291/130272291.html#vsco+filters+apk+ios
    • http://geriproduktai.lt/uploads/1/3/0/6/130639867/195608e502c01d5.pdf
    • http://twopapasoneprincess.com/uploads/1/3/1/4/131453449/vuvosaziw.pdf
    • http://thechurchlawgroup.com/uploads/1/3/0/2/130272325/f5f0a9.pdf
    • http://thearkhouston.com/uploads/1/3/0/8/130874162/tawajanodal_tegeluwoxix_difixezinuzul.pdf
    • http://deboraherickson-irons.com/uploads/1/3/0/6/130639762/272f03a2e4ac73.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_off000083cb.bin
f49dab042a316606424e8613553dd1145402862f55fac01032b8559eff4a3097		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83CB 9472 bytes
font_01_sfnt_off0000a7b2.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7B2 1708 bytes
font_02_sfnt_off0000b018.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB018 16036 bytes

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