Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c51c09d669e599c…

MALICIOUS

PDF

33.1 KB Created: 2021-07-20 13:41:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 695b412cca052fbfa51917427f0dea0a SHA-1: eb953816cd666ff4f3495a0e09694ed7ee914dbc SHA-256: 7c51c09d669e599c49bca5535b7f6b892ce9cfc5aba34d1697c5554890dfb5c6
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple embedded URLs that lure users with promises of game hacks and free in-game currency. The primary URL, http://netcdn.tw/app/406889139/coin-master-free-spins-link-2021-game-hack, is directly associated with a game hack lure. The presence of these links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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 http://netcdn.tw/app/406889139/coin-master-free-spins-link-2021-game-hack PDF link annotation
    • http://kfz-service-etp.de/images/how-to-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://kfz-service-etp.de/images/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://kfz-service-etp.de/images/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://kfz-service-etp.de/images/free-college-textbooks-tiktok_GM835599320.pdfIn PDF document text
    • http://kfz-service-etp.de/images/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • http://kfz-service-etp.de/images/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • http://kfz-service-etp.de/images/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • http://kfz-service-etp.de/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://kfz-service-etp.de/images/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://kfz-service-etp.de/images/free-views-tiktok_GM835599320.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_off00002bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BBD 22776 bytes
SHA-256: 642a0fa8f3f593396440c45121b838bb377ca5e568deeac6650ce1a4f3808487
font_01_sfnt_off00005ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDE 18456 bytes
SHA-256: 405c435adaafa0da304b7a4986d8f56c56dc87ed278d5cff2ac0c57977d8d7e3

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