Malicious PDF — malware analysis report

Static analysis result for SHA-256 110dfb46f492b385…

MALICIOUS

PDF

46.5 KB Created: 2020-04-08 00:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: faa0dde8b08a3c2f15353709b6cfccc9 SHA-1: bff1704477ac49ff712a75e0ac044fce84e3186f SHA-256: 110dfb46f492b385756326a8a78e14bf635c08ff486aff549850010a3814fb8e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to improve search engine rankings. The document body mentions a "Grau video repair tool coupon," suggesting a lure to entice users to click on the embedded links. The ML classifier strongly indicated maliciousness, and the presence of a link farm points towards a malicious intent, likely to distribute further payloads or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://weatherproofguide.com/uploads/1/3/0/6/130605240/130605240.html#grau+video+repair+tool+coupon
    • http://ruthannrossart.com/uploads/1/3/1/0/131070331/resazazor.pdf
    • http://medreadyacademy.com/uploads/1/3/0/6/130604902/dodek.pdf
    • http://beezcreations.com/uploads/1/3/0/6/130639712/dizilalagapipux.pdf
    • http://ntstuff.com/uploads/1/3/1/0/131071145/c3c3aae3.pdf
    • http://doulakaribirthservices.com/uploads/1/3/1/4/131453034/586df6d6ae24f.pdf
    • http://empoweredyouthprograms.com/uploads/1/3/0/6/130603741/kezotifeg.pdf
    • http://fashionthinkers.com/uploads/1/3/0/9/130969983/zoludabevibopegeson.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_off00008b8a.bin
4b282787526571d0d6c0440c3e6e5fedd6497d23ffc4c4d0fc7f6863251f1a53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B8A 8400 bytes

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