Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11ba337cc022d52…

MALICIOUS

PDF

38.6 KB Created: 2021-05-17 22:31:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ad9e83d13f116ebfbcfc7e69d4a4b68b SHA-1: 6afca23a7661fa282f6f5eb6927760ee5404d9f7 SHA-256: a11ba337cc022d52018f4e00899cc9f673b78adab86fa257701e7cbb99c21b92
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic indicating it links to a malicious redirector disguised as a game hack generator. The document body reinforces this lure with text like 'How To Get Free Robux Hack 2021' and 'CLICK HERE TO ACCESS ROBLOX GENERATOR'. The presence of a 'Password-protected archive handoff' heuristic suggests the downloaded payload is likely encrypted, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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
  • 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/how-to-get-free-robux-hack-2021-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003663.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3663 26700 bytes
SHA-256: 47f4cbeef7caeaaa3ae8f827b961a76c91dd25962de9af4c2d16a393c9db1973
font_01_sfnt_off0000733f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x733F 19084 bytes
SHA-256: bf126c80224e4ece1a877f3c45a4e2f725662c205f8b78a709aa4c80730d283c