Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cad1ec523ef4e41…

MALICIOUS

PDF

63.1 KB Created: 2020-05-15 01:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c55d4533af3d82573aaadf5638c6bf4b SHA-1: 5e090387c3aec448f4b55f58b2f0678a6cc7d970 SHA-256: 8cad1ec523ef4e41eb17fb798c54224ad1d740e13d0f5ab386c4037e62c65704
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, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though heavily obfuscated, contains URLs that are consistent with the link farm behavior. This suggests the document's primary purpose is to act as a link farm, potentially for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://beckpm.net/uploads/1/3/0/5/130588230/130588230.html#ecological+species+concept+pdf
    • http://lawrenceprestonmusic.com/uploads/1/3/1/4/131437885/tuweneb.pdf
    • http://everydogisaworkofart.com/uploads/1/3/0/2/130289519/bazunekovodinox-rusuzi-javupakezegu-lojodedozam.pdf
    • http://bgashop.org/uploads/1/3/1/1/131164569/wadekugab.pdf
    • http://cindyscrittercamp.com/uploads/1/3/1/1/131164278/369b61.pdf
    • http://jarrettjohnstonamarillodwiattorney.com/uploads/1/3/0/5/130539871/3782698.pdf
    • http://donutpetbeds.com/uploads/1/3/0/4/130477346/c393302e3.pdf
    • http://sterlingstudiosllc.com/uploads/1/3/0/3/130323161/1959468.pdf
    • http://quintadafonte.net/uploads/1/3/0/7/130776402/zadaronedej.pdf
    • http://pcassessoriacontabil.com/uploads/1/3/1/3/131380619/dalaziwo.pdf
    • http://healthandfitnessbuffs.com/uploads/1/3/0/7/130775118/6617281.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_off0000b466.bin
948fe518ec8f1e2556cf857eda2e90e56fef61ba777bb3c29e0a69e27872bb46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB466 11676 bytes
font_01_sfnt_off0000dc11.bin
1a2b76eb92621148de57a48589384f2ed1ce1add53d2a8f9a0414c0ea737f4f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC11 16148 bytes

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