Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfef88e8b3cab957…

MALICIOUS

PDF

40.5 KB Created: 2021-04-22 15:21:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1fb8fe5f1a6c6bbeb8874cad298a137b SHA-1: 2ce2e950195ba2c371aa409323287dc140643a9d SHA-256: cfef88e8b3cab957464ce450a6b8fe9c17294f1cf4cdca96eef30161b68ac72d
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 4

  • 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.
  • 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://netsecure.pro/app/431946152/raindrop-roblox-exploit-free-game-hack PDF link annotation
    • http://oca.undil.tl/repository/robux-for-free-script.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-roblox-selena-quintanilla.pdfIn PDF document text
    • http://oca.undil.tl/repository/cheats-to-get-free-robux.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-be-a-hacker-in-roblox-like-john-doe.pdfIn PDF document text
    • http://oca.undil.tl/repository/noclip-hack-roblox-2021.pdfIn PDF document text
    • http://oca.undil.tl/repository/adopt-me-roblox-getting-hacked.pdfIn PDF document text
    • http://oca.undil.tl/repository/gun-giver-roblox-script-lua-hack.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-field-of-battle-gold-hack-2021.pdfIn 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_off00003c80.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3C80 27172 bytes
SHA-256: 62df14e79cc16951b6f07ad450c4479bead49d89686331dd1326f872b9c722d3
font_01_sfnt_off00007b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0A 18752 bytes
SHA-256: 64e199b6dd8a9de39e64969412469f050963d9aef9d855ae3d0500da9a3796e7

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