Malicious PDF — malware analysis report

Static analysis result for SHA-256 517c13764ea1cd7a…

MALICIOUS

PDF

51.3 KB Created: 2021-06-02 22:08:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: bfaa8a31485f6ed1346355da49256c58 SHA-1: d40dd28ee2d64f3c66df63bc064edca34dbb9d63 SHA-256: 517c13764ea1cd7a780cb5d2eab9ac02db642b707ad29ac44721d6395f5afbba
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The document presents a fake CAPTCHA to lure the user into downloading a file from the external URL https://netcdn.xyz/app/431946152/roblox-offline-apk-free-download-game-hack. This is a common social engineering tactic to trick users into executing malicious payloads. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9685

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.xyz/app/431946152/roblox-offline-apk-free-download-game-hack
    • http://cosmosdawn.net/images/free-pet-treats-coin-master_GM406889139.pdf
    • https://www.cosmosdawn.net/images/coin-master-hack-progamers_GM406889139.pdf
    • https://www.cosmosdawn.net/images/coin-master-hack-no-human-verification_GM406889139.pdf
    • https://www.cosmosdawn.net/images/coin-master-free-spins-link-2021_GM406889139.pdf
    • https://www.cosmosdawn.net/images/coin-master-free-spin-and-coin_GM406889139.pdf
    • http://cosmosdawn.net/images/how-to-hack-roblox-to-get-robux_GM431946152.pdf
    • http://cosmosdawn.net/images/tiktok-likes-for-free_GM835599320.pdf
    • https://www.cosmosdawn.net/images/robux-generator-that-works_GM431946152.pdf
    • https://www.cosmosdawn.net/images/wurst-mc_GM479516143.pdf
    • https://www.cosmosdawn.net/images/get-free-cards-for-coin-master_GM406889139.pdf
    • http://cosmosdawn.net/images/hacks-roblox_GM431946152.pdf
    • http://cosmosdawn.net/images/minecraft-free-android_GM479516143.pdf
    • https://www.cosmosdawn.net/images/hack-coin-master-xyz_GM406889139.pdf
    • https://www.cosmosdawn.net/images/roblox-mobile-hack_GM431946152.pdf
    • http://cosmosdawn.net/images/2021-no-human-verification-hack-for-coin-master_GM406889139.pdf
    • http://cosmosdawn.net/images/roblox-free-robux_GM431946152.pdf
    • https://www.cosmosdawn.net/images/coin-master-free-spin-link-today-50_GM406889139.pdf
    • https://www.cosmosdawn.net/images/tiktok-free-jazz_GM835599320.pdf
    • https://www.cosmosdawn.net/images/free-tiktok-fans-no-human-verification-or-downloading-apps_GM835599320.pdf
    • http://cosmosdawn.net/images/blox-land-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000507c.bin
c091b02ebc3dcaeee42b197396c7aa3f125ef2b06f76502908302c2b7ea1f9f7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x507C 26760 bytes
font_01_sfnt_off00008dae.bin
eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DAE 2940 bytes
font_02_sfnt_off000097b3.bin
49734f51977507cba6bc8d3ad0cee0363aa119856db094427deb9cf565bb7bca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97B3 3120 bytes
font_03_sfnt_off0000a2c7.bin
3ff0717f03347678517f767503a395c3d478b722014c1932e3d3ee216aafa954		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2C7 19148 bytes

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