Malicious PDF — malware analysis report

Static analysis result for SHA-256 7957bc5f29adc196…

MALICIOUS

PDF

48.1 KB Created: 2021-06-08 19:54:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 37ef88b3f2ceb8a842ec1e8b8130cffb SHA-1: e65db59dcacbcc6d18d69713408858dde2fd6b55 SHA-256: 7957bc5f29adc196fc6194d83bf8d1efd0e90feb52251a06cabab785801e3e39
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick users into interacting with it, likely to download a second-stage payload from the embedded URL. The ML classifier strongly indicated maliciousness, and the presence of external URIs further supports this. No scripts were extracted, but the overall pattern suggests a downloader or exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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/robux-hack-not-patch-game-hack
    • https://www.levanajewelryclub.com/uploaded_files/userfiles/files/coin-master-free-spins-hack-link_GM406889139.pdf
    • https://www.levanajewelryclub.com/uploaded_files/userfiles/files/free-spins-and-coins-for-coin-master_GM406889139.pdf
    • https://www.levanajewelryclub.com/uploaded_files/userfiles/files/coin-master-hack-xyz_GM406889139.pdf
    • https://www.levanajewelryclub.com/uploaded_files/userfiles/files/free-robux-admin-panel_GM431946152.pdf
    • https://www.levanajewelryclub.com/uploaded_files/userfiles/files/coin-master-hack-ios-jailbreak_GM406889139.pdf
    • https://www.levanajewelryclub.com/uploaded_files/userfiles/files/need-free-spins-for-coin-master_GM406889139.pdf
    • https://www.levanajewelryclub.com/uploaded_files/userfiles/files/free-robux-without-human-verification-2021_GM431946152.pdf
    • https://www.levanajewelryclub.com/uploaded_files/userfiles/files/coin-master-free-online_GM406889139.pdf
    • https://www.levanajewelryclub.com/uploaded_files/userfiles/files/como-hackear-juego-coin-master_GM406889139.pdf
    • https://www.levanajewelryclub.com/uploaded_files/userfiles/files/free-robux-download_GM431946152.pdf
    • https://www.levanajewelryclub.com/uploaded_files/userfiles/files/free-robux-human-verification_GM431946152.pdf
    • https://www.levanajewelryclub.com/uploaded_files/userfiles/files/free-minecraft-bedrock-server-hosting_GM479516143.pdf
    • https://www.levanajewelryclub.com/uploaded_files/userfiles/files/hackear-juego-coin-master-espaol_GM406889139.pdf
    • https://www.levanajewelryclub.com/uploaded_files/userfiles/files/free-robux-mobile_GM431946152.pdf
    • https://www.levanajewelryclub.com/uploaded_files/userfiles/files/roblox-a_GM431946152.pdf
    • https://www.levanajewelryclub.com/uploaded_files/userfiles/files/robux-get-com_GM431946152.pdf
    • https://www.levanajewelryclub.com/uploaded_files/userfiles/files/how-to-get-hacks-on-roblox_GM431946152.pdf
    • https://www.levanajewelryclub.com/uploaded_files/userfiles/files/coin-master-computer-hack_GM406889139.pdf
    • https://www.levanajewelryclub.com/uploaded_files/userfiles/files/bux-gg-robux-free_GM431946152.pdf
    • https://www.levanajewelryclub.com/uploaded_files/userfiles/files/coin-master-free-spins-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005203.bin
05b8d280607de36ea45ffa6dbf28d037a70ac84e52d039bbd4b9a8098307473a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5203 30124 bytes
font_01_sfnt_off0000988d.bin
46c62d05fd8d5a112c057a65e7930c57330c32948867103e0da2c4a3671f145e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x988D 18672 bytes

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