Malicious PDF — malware analysis report

Static analysis result for SHA-256 709c57d35a44ed94…

MALICIOUS

PDF

47.3 KB Created: 2021-05-17 01:00:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7cba5535de7961165a7db72acc1a4c5a SHA-1: 356e6db8a9fb2f892c187748b0da544ee1f32616 SHA-256: 709c57d35a44ed949c75b5a4389b9de5bb02cbbc43f79569727df13b05e48e98
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document presents a fake CAPTCHA to trick users into interacting with it, which is a common social engineering tactic. It contains an embedded URI pointing to a suspicious URL, likely intended to download a malicious payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/406889139/coin-master-daily-free-spins-link-today-2021-game-hack
    • https://selesindihome.com/ckfinder/userfiles/files/coin-master-free-spins-promo-code_GM406889139.pdf
    • https://selesindihome.com/ckfinder/userfiles/files/free-coin-master-cards_GM406889139.pdf
    • https://selesindihome.com/ckfinder/userfiles/files/master-coin-free-spin_GM406889139.pdf
    • https://selesindihome.com/ckfinder/userfiles/files/online-coin-master-free-spin-app_GM406889139.pdf
    • https://selesindihome.com/ckfinder/userfiles/files/free-robux-com-roblox_GM431946152.pdf
    • https://selesindihome.com/ckfinder/userfiles/files/get-robux-now_GM431946152.pdf
    • https://selesindihome.com/ckfinder/userfiles/files/free-robux-hack_GM431946152.pdf
    • https://selesindihome.com/ckfinder/userfiles/files/free-roblox-accounts-with-robux_GM431946152.pdf
    • https://selesindihome.com/ckfinder/userfiles/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdf
    • https://selesindihome.com/ckfinder/userfiles/files/card-hack-in-coin-master_GM406889139.pdf
    • https://selesindihome.com/ckfinder/userfiles/files/clients-minecraft_GM479516143.pdf
    • https://selesindihome.com/ckfinder/userfiles/files/coin-master-free-spins-link-today-twitter_GM406889139.pdf
    • https://selesindihome.com/ckfinder/userfiles/files/roblox-avatar-free_GM431946152.pdf
    • https://selesindihome.com/ckfinder/userfiles/files/haktuts-coin-master-today_GM406889139.pdf
    • https://selesindihome.com/ckfinder/userfiles/files/coin-master-free-spin-generator-without-human-verification_GM406889139.pdf
    • https://selesindihome.com/ckfinder/userfiles/files/daily-free-spins-for-coin-master_GM406889139.pdf
    • https://selesindihome.com/ckfinder/userfiles/files/minecraft-free-download-android_GM479516143.pdf
    • https://selesindihome.com/ckfinder/userfiles/files/free-girl-hair-roblox_GM431946152.pdf
    • https://selesindihome.com/ckfinder/userfiles/files/coin-master-daily-free-spins-link-app_GM406889139.pdf
    • https://selesindihome.com/ckfinder/userfiles/files/free-robux-real_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004aa2.bin
03987a63dffcbf5918613bf01a086fe70575b545770bedb95591c1bf6cfc9fa9
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AA2 27652 bytes
font_01_sfnt_off00008a55.bin
3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A55 2840 bytes
font_02_sfnt_off00009407.bin
51ec1fd699785aa8f843f12306ac352f9679003eb9b4544ea09afbac11be1d71
pdf-font-stream PDF embedded font (sfnt) at offset 0x9407 19052 bytes