Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f822ab6802e5bef…

MALICIOUS

PDF

40.7 KB Created: 2020-04-13 17:11:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0be332e99934532f14333d7fff246d12 SHA-1: 18700deab5143acfb81fd869283f0703ecf9d549 SHA-256: 7f822ab6802e5befb13cd87ef7f102f87b4a48de34608b134d1f41c889bc789e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF file contains numerous external links to various domains, many of which follow a similar numeric-slug pattern, indicating a link farm or SEO abuse tactic. The primary external URI points to 'lotifun.com' with a title suggesting a Dota 2 guide, which is likely a lure. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the heuristic firings and embedded URLs suggest a drive-by download or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://lotifun.com/uploads/1/3/1/4/131437116/131437116.html#compendium+dota+2+predictions+guide
    • http://murraywhiteley.com/uploads/1/3/0/5/130590656/juxinuzor.pdf
    • http://glowing-moments.com/uploads/1/3/0/4/130489175/9e5fb05191.pdf
    • http://wa8myw.com/uploads/1/3/0/4/130476313/3812833.pdf
    • http://jasmine-reyes.com/uploads/1/3/0/5/130588280/bimikamekamer.pdf
    • http://hildebrandtelectric.com/uploads/1/3/0/4/130488451/kavoba-bovidaj.pdf
    • http://mschh.org/uploads/1/3/0/6/130604065/bunovanupe-bavenikativov.pdf
    • http://cranbournechromelimited.com/uploads/1/3/0/6/130621209/tipomewoz.pdf
    • http://mschh.org/uploads/1/3/0/6/130604065/bunovanupe-bavenikativov.p
    • 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_off000077b1.bin
9da5fa2f55244dd4ad27c8fb0d90dace6d02db6c8806232b82432c76be4efdf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B1 8060 bytes

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