Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0cc900cff38ab76…

MALICIOUS

PDF

36.5 KB Created: 2020-04-09 07:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dd2ff41e7df47f772f1e695cb8c6fdf4 SHA-1: 5ebe4968d13f9205b9dd17e80449b627e1fb6580 SHA-256: b0cc900cff38ab76a55c81e6de8de874a84da90219844d98dadeb231bb44c15c
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files on different domains. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though heavily obfuscated, contains references to the URLs, suggesting a coordinated effort to redirect users. The primary attack pattern appears to be a link farm designed to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://bikernutz.org/uploads/1/3/0/7/130738893/130738893.html#relative+and+absolute+gains+in+neorealism
    • http://engpossible.com/uploads/1/3/0/3/130379485/zezonob.pdf
    • http://thomasryan.co/uploads/1/3/0/5/130542718/gifekuzaro.pdf
    • http://watchvideo4k.club/uploads/1/3/0/7/130775782/jozarinitaz.pdf
    • http://kristin-shea.com/uploads/1/3/0/7/130739472/4989532.pdf
    • http://celebratebypa.com/uploads/1/3/0/3/130379741/2ce09f97f8e8cc4.pdf
    • http://atleeinvestigates.com/uploads/1/3/1/3/131381151/biwode.pdf
    • http://firstclassselfstorage.org/uploads/1/3/1/4/131453927/karexabutik.pdf
    • http://soluzionielettroniche.net/uploads/1/3/0/5/130588581/xolabovina.pdf
    • http://equicanivita.ch/uploads/1/3/0/9/130969037/6d273b6.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_off0000650f.bin
66f9a83ab3d36a91aed490dc60ff034f306bc9085c35227f21244f3188b5a079		 pdf-font-stream PDF embedded font (sfnt) at offset 0x650F 7760 bytes

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