Malicious PDF — malware analysis report

Static analysis result for SHA-256 4323f06ea634da68…

MALICIOUS

PDF

42.5 KB Created: 2020-04-27 05:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 10e2267ae28dd03f857cd5cc94a6adfc SHA-1: 4de17ac1397b508501672d7143d2cbb8329b2e92 SHA-256: 4323f06ea634da683202c94b9c60236de65911a28386008e5556d8a30c525f02
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the link farm. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact payload or intent beyond the link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://noblebase.com/uploads/1/3/0/4/130476481/130476481.html#pixark+full+version
    • http://lucaslandscapes.net/uploads/1/3/0/5/130545666/bbf963c8af0de4.pdf
    • http://hessenergyllc.com/uploads/1/3/0/7/130776159/859617.pdf
    • http://limitlesspilot.net/uploads/1/3/0/2/130288341/jesula.pdf
    • http://silkrainbow.net/uploads/1/3/1/3/131398003/xuzedezisoropov.pdf
    • http://stadiacatering.com/uploads/1/3/1/6/131606974/duxokefiso_tekuwefopaz.pdf
    • http://baddowroadphotography.com/uploads/1/3/0/7/130740211/wotix-renid-josen-buritufi.pdf
    • http://marcusthibodeau.net/uploads/1/3/0/6/130620512/fegifo-xanub-lovesuxemifu.pdf
    • http://nonnibarn.com/uploads/1/3/0/3/130313319/nutoduzorofeki-guzujo-panep.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_off000068b4.bin
625cf7f01fbd829fdda5e6ddcf4cbbceb1e241ac3d7366744c7a931c858472e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68B4 8100 bytes
font_01_sfnt_off00008823.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8823 16036 bytes

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