Malicious PDF — malware analysis report

Static analysis result for SHA-256 55466a73b5a2a00d…

MALICIOUS

PDF

44.4 KB Created: 2020-04-08 18:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c49646b0ade3f028678670cd6695ee0f SHA-1: 2f13bfe4eff127445f842d24b260e701c4485b0b SHA-256: 55466a73b5a2a00d9f7283c228ad49eb6f8462880a2a6f7ad261754226098f8f
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, many of which point to PDF files on unrelated domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, a common tactic for SEO manipulation or to host malicious content. The ML classifier strongly flagged this PDF as malicious. The document body contains text related to 'Dishonored 1 corvo' and metadata from wkhtmltopdf, suggesting it might be a lure document generated by a tool.

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://medinaguidedtours.com/uploads/1/3/0/4/130483690/130483690.html#dishonored+1+corvo
    • http://thesunatlantic.com/uploads/1/3/1/4/131438641/43cede7914.pdf
    • http://nasrastreasures.com/uploads/1/3/0/6/130639997/movanozo.pdf
    • http://lostatseamusic.com/uploads/1/3/0/7/130776257/1a0e8d0e17b34a.pdf
    • http://valley-braids.com/uploads/1/3/0/7/130739224/nafodupezefusazo.pdf
    • http://yogawithstacy.com/uploads/1/3/0/2/130289629/377596.pdf
    • http://rokforcefusion.com/uploads/1/3/0/7/130776056/kinuvubiti.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_off000087ec.bin
f50654361a7d30e3e6265b78c0c8fa3114220644a17a6a3a34328265fed34738		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87EC 7532 bytes

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