Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb93923197e926d…

MALICIOUS

PDF

44.2 KB Created: 2021-06-09 03:41:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: bde5e286cb2ac25ed5e5d4a1d65a3dc7 SHA-1: df661a3e9c29be39b84f968364a82028b81ee7c7 SHA-256: 8cb93923197e926ddedd3260b4da2cc7810b88545e7006c318e5f1bb595ee6e8
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high-severity heuristic firing for a 'GAME_HACK_REDIRECT_LURE', indicating it links to a site promising free game hacks. The embedded URL 'https://netcdn.tw/app/431946152/irobux-com-free-robux-game-hack' directly supports this lure. While no scripts were extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a potentially malicious site, likely for credential harvesting or further malware delivery.

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.tw/app/431946152/irobux-com-free-robux-game-hack PDF link annotation
    • https://limebug.com/media/storage/editor/files/apk-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-get-free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/minecraft-116-apk-download_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-hack-with-facebook-login_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-android_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/daily-coin-master-free_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-cheats-free_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/minecraft-hacks-list_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/google-roblox-games_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/minecraft-hacked-client_GM479516143.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_off00004fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FE2 25972 bytes
SHA-256: c59bd92a0f167536a24a800b07994a10a45c2a6e3e50f7baa9ea7b50b6ec515d
font_01_sfnt_off00008a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A16 18276 bytes
SHA-256: 1ef73b4d85ba0755501b833b83121003dfb89a6e7377c767facbe2cc6bd5101f

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