Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fb4720baca7c97…

MALICIOUS

PDF

35.3 KB Created: 2021-07-08 19:22:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cdef747f26212f50c02fb447e4222098 SHA-1: ab3b5f88f197dea797e281081b8bc18222f0ee27 SHA-256: 71fb4720baca7c97514d8516890d54a0a86419bf272e642c7d583bd80b6f3b90
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 0.9980

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/coin-master-fan-club-game-hack PDF link annotation
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/mouse-ears-roblox-free_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/coin-master-hack-mod-apk-download_GM406889139.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/install-roblox-hacked-version_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/roblox-download-free-games_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/minecraft-com-free_GM479516143.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/roblox-infinite-jump-hack-2021_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/hack-roblox-2021-savanna-wild_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/roblox-ps3-free-download_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/free-robux-android_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/enter-password-for-free-robux-animation_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/minecraft-free-online_GM479516143.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/roblox-lumber-tycoon-2-cheats-xbox-one_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/coin-master-tiradas-gratis-2021_GM406889139.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/coin-master-game-hack-kaise-kare_GM406889139.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/how-to-hack-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/best-free-hacked-client_GM479516143.pdfIn PDF document text
    • https://zephyrtoys.com/assets/ckfinder/userfiles/files/free-balloon-pauldrons-on-roblox_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
stream_002_off000031f3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31F3 23504 bytes
SHA-256: 8974f4fd7e4f9d91dbea21ab38973e3b160bce10b99591aa9c2d36fb410b170c
font_01_sfnt_off00006730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6730 18372 bytes
SHA-256: 22074970575eadcad87cb52a622e0a0fed1ce08607426e4f3de5779985964155