Malicious PDF — malware analysis report

Static analysis result for SHA-256 f259b5c4f55a25b6…

MALICIOUS

PDF

37.1 KB Created: 2021-05-23 13:48:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b2886ab13a55d1757f5c502d0d9c93ce SHA-1: aba6ff866ad385a70ffa4f31842d66b1db705c0c SHA-256: f259b5c4f55a25b6c1747e399a28141099eb1477d2d15b15e76df41eec1e5f42
122 Risk Score

Malware Insights

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

The PDF document contains a lure for free Robux and game hacks, directing users to a malicious URL. It also displays a fake CAPTCHA to trick users into interacting with the content, likely to download a second-stage payload. No scripts were extracted, but the embedded URLs and the fake CAPTCHA heuristic strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/free-robux-roblox-promo-codes-game-hack PDF link annotation
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/pokemon-go-free-zangoose_GM1094591345.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/coin-master-free-coins-generator_GM406889139.pdfIn PDF document text
    • https://www.kis.ac.th/kis_international/assets/uploads/img/all/files/roblox-hack-me-robux_GM431946152.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
font_00_sfnt_off00003351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3351 25720 bytes
SHA-256: 25dd03c84353156d2d8a52b190341ec1e5a4fcf79238a49cb30ca01f24afdfb2
font_01_sfnt_off00006eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB3 18676 bytes
SHA-256: 9297a3cb5fba7ca587652f513aa1222127deb04773b45a9c0f6482a9c793d56f

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