Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed15781d5feb966…

MALICIOUS

PDF

35.7 KB Created: 2020-05-31 06:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e71e9993b5dd4bf76156177e5cf36184 SHA-1: 705ab46cf09cf76d12cf05d50974e646b664ff0a SHA-256: 8ed15781d5feb9668c07dfc1553f2b6a44eaf8317d45f0b9baed57952009957b
96 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or a redirection mechanism designed to lead users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://kiss-n-cakes.com/uploads/1/3/0/6/130605335/130605335.html#fields+of+gold+tab
    • http://webmail.commerceelementarypta.com/uploads/1/3/1/6/131606321/4592448.pdf
    • http://rebeccasdesign.com/uploads/1/3/0/8/130873794/ninama_miluxenupewora.pdf
    • http://jayndebate.com/uploads/1/3/0/3/130323622/9abeba73.pdf
    • http://boeing737sim.se/uploads/1/3/0/3/130323109/c8dabb097c1a3.pdf
    • http://gappifyalan.com/uploads/1/3/0/6/130603884/7dac0c1162e091e.pdf
    • http://nopeus.de/uploads/1/3/0/4/130435697/e0e76c8da3.pdf
    • http://aleisyaaz.com/uploads/1/3/0/5/130541285/1451489.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_off000052d7.bin
98da5072a2bd80a3227d4795bcc474ca0ef44a897143498b78186679176079b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52D7 3020 bytes
font_01_sfnt_off00005f0f.bin
d94d31383ed17a4b0dc7118e0684f832a4c0e1c9cbc2c459b9cdce251f801345		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0F 10752 bytes

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