Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ac4fa89be9715c…

MALICIOUS

PDF

34.0 KB Created: 2021-07-08 06:21:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b0de3f30806d8f2ec7f6462b8c358be3 SHA-1: 53347ca8cd1ef1ab89309dbe63c04813a2f63cca SHA-256: 37ac4fa89be9715cf3c218ba4290ebbfeb1477adbdc1cf7573cb2843f6444e69
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-severity heuristic firing for a 'GAME_HACK_REDIRECT_LURE', indicating it links to a site promising free game hacks. The document body and embedded URLs confirm this, pointing to 'http://netcdn.tw/app/406889139/free-coin-master-cards-game-hack'. This suggests a phishing or scam attempt to redirect users to a potentially malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/free-coin-master-cards-game-hack PDF link annotation
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/is-minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/coin-master-spin-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/groupe-nicdaraiche-free-robux_GM431946152.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/free-robux-apk_GM431946152.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/noclip-hack-for-prison-liferoblox_GM431946152.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/tiktok-free-tv-shows_GM835599320.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/giving-away-free-robux-cards_GM431946152.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/free-gamepasse-roblox_GM431946152.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/earn-robux_GM431946152.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/freer-pro-tiktok-fans_GM835599320.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/how-to-o-get-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdfIn PDF document text
    • https://kultura.orb.ru/uploads/ckfinder/userfiles/files/coin-master-pet-food-hack_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_002_off0000305b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x305B 22484 bytes
SHA-256: c6d866d1fc65b381c97e423d77c8eaffb4e6a50070bc82fecfcc57c4d2a236ec
font_01_sfnt_off0000628e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x628E 18172 bytes
SHA-256: 2fc47c4066dd28e3547f22ef08ec611cc49326c2517731f27ce49f34897b6455