Malicious PDF — malware analysis report

Static analysis result for SHA-256 5515d91f62ee461a…

MALICIOUS

PDF

37.3 KB Created: 2021-05-17 21:50:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 825e55fb73c1ea9227ef9b879ca33bf6 SHA-1: 52a3ed117a73809dd114450fc012550e2a3319df SHA-256: 5515d91f62ee461aec29b4d7f6678093482afe607136090178c1d95a297d186e
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a high-severity heuristic indicating it links to a 'free generator / game hack' lure. This is further supported by another heuristic flagging it as a browser extension/update installation lure, a common social-engineering tactic. The primary malicious URL identified is likely the destination for this lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 https://netcdn.xyz/app/431946152/claim-free-robux-button-game-hack PDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003223.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3223 26224 bytes
SHA-256: ae62c169a51117217edc2f285b29291f44dc0e197dd7aec20ae26d460cb4f1c2
font_01_sfnt_off00006f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F13 18800 bytes
SHA-256: a65a8cc7dc4bcbd85f0772ba27416f5bddaec9beaf507a16cddd286b7aed5464

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