Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf0421aba3f2ffb…

MALICIOUS

PDF

44.3 KB Created: 2021-06-03 22:15:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5daf8a4f9b65889c9a57fc9df65180c4 SHA-1: cf427abcd84b07f88587f727e2328be39756550f SHA-256: fcf0421aba3f2ffb719b25d58c51efff323871c86ec9b63256548bbb41eaea38
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9865

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://netcdn.online/app/406889139/daily-free-spin-coin-master-link-game-hack PDF link annotation
    • http://www.js100.com/uploads/ckeditor/files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-daily-free-spins-link-today-2021-free_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/robux-rewards_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/latest-free-spin-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-many-villages-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/cool-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-minecraft-worlds_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-roblox-avatar-ideas_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-minecraft-java-edition-codes_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-35-13-hack-download_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-gamepasses-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-daily-free-spins-and-coins_GM406889139.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_004_off00005121.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5121 24760 bytes
SHA-256: 83b0bc11c82d27e21a2b869d15936dba73abbfd6d9b14dc01cd59af6ff065853
font_01_sfnt_off000089fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89FA 18476 bytes
SHA-256: 13087f23ced5a654764a402ace47e06b7ceeb886891228a443e0cb07dd9c4176

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