Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ba4043a6fb92a3…

MALICIOUS

PDF

29.6 KB Created: 2020-05-27 09:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8111612adcafb71a78c3cacda006ef50 SHA-1: 94c88800e26985fabf30c7d95759c29746aacdde SHA-256: 74ba4043a6fb92a3e78bcc6fb1a6f5ee1ee1e62a27c09764a0e66deefe564ea9
96 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs that point to external websites, some of which are structured like link farms. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic suggests a pattern of generating numerous links to potentially malicious content. No scripts were extracted, but the presence of numerous external links indicates a likely attempt to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9815

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://d1uxc0.bdgct.com/uploads/1/3/1/8/131857114/131857114.html#vestal+brig+watch+manual
    • http://wearethesecretweapon.org/uploads/1/3/0/7/130739923/kaxuxelij-nenud-semivimumeve-mojolazubusa.pdf
    • http://haydenbrough.com/uploads/1/3/1/3/131381302/6544241.pdf
    • http://janicehicks.com/uploads/1/3/0/6/130604580/fadope_pubajeboba_bivagovavu_gopenudutovatek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048c6.bin
6e343b3284c3efac96165a606eb5cddc2dfc834ed50dd7e2babd3683762d9a77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48C6 10508 bytes

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