Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b558199f69d330…

MALICIOUS

PDF

38.4 KB Created: 2020-04-07 22:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0fec00e53287ce3d47f5730cd3b4269e SHA-1: 162d6727e9f373816f3b10bc289b77311f415769 SHA-256: a3b558199f69d330d76168fbf27a9ef81034400b68f80f3a18282cf77fd60932
94 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier with high confidence. It contains numerous external links, as indicated by the PDF_URI and PDF_SEO_LINK_FARM heuristics. These links point to various PDF files hosted on different domains, suggesting a link farm or redirection scheme designed to lure users to malicious content. No scripts were extracted from this sample.

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://richkane.biz/uploads/1/3/0/5/130589279/130589279.html#re+zero+episode+18
    • http://rochesterfleetservice.com/uploads/1/3/0/4/130488252/5663358.pdf
    • http://groovemanoova.net/uploads/1/3/0/3/130379352/toveja.pdf
    • http://pt2plus.com/uploads/1/3/0/9/130969245/fc754455b56f9.pdf
    • http://railroadbrewingco.com/uploads/1/3/0/4/130435695/18018.pdf
    • http://vickywong.me/uploads/1/3/1/4/131454049/28117.pdf
    • http://autosbuy.net/uploads/1/3/0/6/130639739/1884816.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_off00005ef8.bin
fb19e2a31d53cef3ac0652196669ebea07ea9388095b351a842b5aec1edb0195		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF8 7728 bytes
font_01_sfnt_off00007ce4.bin
5575149bed1e0889843c8c6aca697ede52d83f00e13bb1528e74b456c3447869		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE4 5008 bytes

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