Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b648f8b2da237f5…

MALICIOUS

PDF

37.8 KB Created: 2021-06-19 22:08:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: a6fce9882b806cc2d5579ad009324260 SHA-1: bd9ca214d12aa9757f148fd32ec9b0c18a9abf10 SHA-256: 3b648f8b2da237f5498c835899093090207f6c99ddca3802bb5d780253949794
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 0.9886

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.co/app/406889139/best-free-spins-link-coin-master-game-hack PDF link annotation
    • https://limebug.com/media/storage/editor/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-game-hacks-2021_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-jackpot-madness-hack_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/robux-free-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-legally-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/bux-city-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-hack-clients-jailbreak_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/static-moonactive-net-free-spins_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/minecraft-online-free-no-download_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-to-play-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-hack-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/minecraft-free-reddit_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-mobile-cheat-codes_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-do-you-change-your-name-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000031fe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31FE 23220 bytes
SHA-256: 517cd4bb3bb9b6f9baa3c3ef44e26c0ae5e3516027bbf13125f83dd0846b6262
font_01_sfnt_off00006646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6646 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off0000702b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x702B 18560 bytes
SHA-256: f4e5c5d747b0ffea5d5709502c5f789dc406614ec4bfae31758420bcc4675b97

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