Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99c8d2562b0813f…

MALICIOUS

PDF

41.7 KB Created: 2020-04-03 15:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1edf60a5e281f4cadc7e1d4f18f73100 SHA-1: af69994c386cb3adb1159b332b15db24a284cf1e SHA-256: a99c8d2562b0813f756a5c7de42a9fc1d3291943e198b8f7c58395f6a8629bda
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized with numeric slugs and appear to be part of a link farm. The ML classifier strongly indicated maliciousness. The primary purpose appears to be directing users to a network of suspicious websites, likely for phishing or distributing further malware.

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://moms-life.net/uploads/1/3/0/7/130740001/130740001.html#bose+quietcomfort+15+ear+pad+replacement
    • http://atltid.com/uploads/1/3/0/7/130776328/6631906.pdf
    • http://kcshore.com/uploads/1/3/0/6/130604737/6be742f7e5.pdf
    • http://failsafe-electric.com/uploads/1/3/0/4/130436224/wosuj_wazelevuzaxetal_talon_xofupuj.pdf
    • http://amyandnickmakemusic.com/uploads/1/3/0/9/130969810/ee4747e3bd.pdf
    • http://emigrateawayusa.com/uploads/1/3/0/7/130775702/rodetagovowi_nupegilamozusa_kanikome_bonalul.pdf
    • http://moviescloud.online/uploads/1/3/0/5/130588546/1a1cc3334a.pdf
    • http://compassemail.com/uploads/1/3/1/4/131407944/bogodesuregofuk.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_off00007a25.bin
2b6c58e8e1aece58c0a9703022d30071b1d0cd423bd1fae5268ca74488a6ac3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A25 8256 bytes

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