Malicious PDF — malware analysis report

Static analysis result for SHA-256 e82481db90d3ad9a…

MALICIOUS

PDF

49.2 KB Created: 2021-06-11 02:38:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: aa3dcf1759cf331065d5b76d1df23196 SHA-1: 2fe4345216b385176a77c452095fec129eb5966d SHA-256: e82481db90d3ad9a2b8eb9d8f901a89613df64e1fdd56cdb1105d30e615897a1
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document presents a fake CAPTCHA to lure the user into downloading a file, likely a malicious payload. The embedded URL points to a resource related to game hacks, further supporting the lure. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to exploit user interaction for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/roblox-t-shirt-maker-free-game-hack
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/can-you-give-me-free-robux_GM431946152.pdf
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/minecraft-pe-texture-packs-free-download_GM479516143.pdf
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/coin-master-hack-app_GM406889139.pdf
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/hacker-que-banea-e-invisible-roblox_GM431946152.pdf
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/roblox-download-game-free_GM431946152.pdf
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/daily-free-spins-coin-master-heaven_GM406889139.pdf
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/free-robux-2021_GM431946152.pdf
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/minecraft-items_GM479516143.pdf
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/free-robux-for-kids-no-verification_GM431946152.pdf
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/pokemon-go-free-upgrade_GM1094591345.pdf
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/roblox-robux-generator-tool_GM431946152.pdf
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/how-to-get-free-robux-on-mobile_GM431946152.pdf
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdf
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/how-to-hack-mcpe-master-coins_GM406889139.pdf
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/minecraft-xbox-one-free_GM479516143.pdf
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/minecraft-java-edition-key-free_GM479516143.pdf
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/hack-mod-coin-master_GM406889139.pdf
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/free-robux-with-no-human-verification_GM431946152.pdf
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/coinmasterfreespins_GM406889139.pdf
    • https://sedotwcsaluranmampet.com/ckfinder/userfiles/files/coin-master-free-spin-and-coins-links_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000053a2.bin
d702b63f183a16d694afde846b9f1423ac871efebc3253bc915b10678eb4747f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53A2 26012 bytes
font_01_sfnt_off00008ebb.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EBB 5696 bytes
font_02_sfnt_off00009bcd.bin
c5f34d5e6c4b6b85e061c50e0aea34bf0cdf828fd23d45c0be9ad3d64035bb53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BCD 18932 bytes

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