Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5e441221591e33…

MALICIOUS

PDF

33.7 KB Created: 2021-07-01 16:42:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 397826c99671a874d3a7d338619395b5 SHA-1: 0571258eae7183b176b34deba0a2c63638addcc2 SHA-256: af5e441221591e333180a3436bdb431674467fed749d2dd9f3948c8c3def2d03
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.co/app/406889139/master-coin-hack-game-game-hack PDF link annotation
    • https://limebug.com/media/storage/editor/files/mod-skin-roblox-free_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/i-want-free-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/official-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-et-free-robux-april-2021-pc_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-hack-robux-sin-verificacion_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/robux-generator-that-works_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-hack-mod-game-download_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/get-free-roblox_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/como-hackear-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-roblox-girl-hair-not-a-model-or-decal_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/instatn-robux-hack_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/mcpe-download_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/minecraft-for-free-games_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-hacks-hub_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/tiktok-free-wallpapers_GM835599320.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-rocitizens-money-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-get-free-robux-in-roblox-sub_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_off00002de4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2DE4 22828 bytes
SHA-256: 8049c42dec2c8e079d31a80091bdac2f1c773429889e0473d86da8254ac41e7b
font_01_sfnt_off00006106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6106 18264 bytes
SHA-256: 4a5fae70639e3f7ad74a8b5463b1206e0a2e0224746e08acf5f0c1dacc4d336e

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