Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7563a286bdc7e62…

MALICIOUS

PDF

34.4 KB Created: 2020-04-07 22:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ef69b8a18c249acb9a649492039dc477 SHA-1: 5561c3afbe39c7cc9105bb95d98aac608cbf2c02 SHA-256: c7563a286bdc7e624dd60265f88b6df262ea9ffce76317b30d317c53497e731f
94 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are structured as SEO link farms. The document body itself contains a lure referencing 'Barfi full movie with english subtit' and includes several of these suspicious URLs. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent behind the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://easyfreelegal.com/uploads/1/3/1/4/131453723/131453723.html#barfi+full+movie+with+english+subtit
    • http://bodycarestudio.com/uploads/1/3/1/1/131163780/9e05a45.pdf
    • http://waterbedsamerica.com/uploads/1/3/0/9/130969139/6187245.pdf
    • http://statestreetproject.org/uploads/1/3/1/4/131406413/bujusodu.pdf
    • http://michaelholt.ca/uploads/1/3/1/1/131163684/patatefujugagu.pdf
    • http://allamericanutilities.com/uploads/1/3/1/0/131070171/gexuverobimomuxagi.pdf
    • http://pawsandclawspetcare.net/uploads/1/3/1/3/131383650/jexorogatanatuw.pdf
    • http://mta-sts.bigdipperbeeco.com/uploads/1/3/1/4/131407974/1381712.pdf
    • http://flybeyondthesyllabus.com/uploads/1/3/0/6/130640181/votizulowadudamob.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_off00005e28.bin
67e35c6ee56fc3e0b3b895616f6e78cdfd562e1da444b21aa0322e8fb13922f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E28 7972 bytes

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