Malicious PDF — malware analysis report

Static analysis result for SHA-256 025c736d9c4bbbcb…

MALICIOUS

PDF

35.7 KB Created: 2021-07-06 07:52:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b09fd4d640d620f6da536f0d07574411 SHA-1: 0958f615ab4334951c4af723923dc3fb4e975cf3 SHA-256: 025c736d9c4bbbcbb92cc94a470c16787bd7d1b5b81a4c4200d2699d0ebbf953
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to trick users into downloading a file, likely a game cheat or exploit. The presence of multiple URLs pointing to similar content suggests a phishing or scam campaign. While no scripts were directly extracted, the ML classifier and heuristic firings strongly indicate malicious intent, likely involving the exploitation of a client vulnerability to execute a downloaded payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/rbxfree-com-free-robux-game-hack
    • http://opac.library.uib.ac.id/repository/roblox-flood-escape-hack-script_GM431946152.pdf
    • http://opac.library.uib.ac.id/repository/free-minecraft-bedrock-server_GM479516143.pdf
    • http://opac.library.uib.ac.id//repository/minecraft-wurst-hacked-client_GM479516143.pdf
    • http://opac.library.uib.ac.id//repository/how-to-hack-robux_GM431946152.pdf
    • http://opac.library.uib.ac.id/repository/coin-master-hack-2021-android-apk_GM406889139.pdf
    • http://opac.library.uib.ac.id//repository/coin-master-free-spins-and-coins-link-today_GM406889139.pdf
    • http://opac.library.uib.ac.id//repository/roblox-hack-unlimited-robux_GM431946152.pdf
    • http://opac.library.uib.ac.id/repository/free-robux-no-human-verification-required_GM431946152.pdf
    • http://opac.library.uib.ac.id/repository/coin-master-free-spins-glitch_GM406889139.pdf
    • http://opac.library.uib.ac.id/repository/easy-way-to-get-free-robux_GM431946152.pdf
    • http://opac.library.uib.ac.id/repository/how-to-get-free-robux-youtube_GM431946152.pdf
    • http://opac.library.uib.ac.id/repository/how-to-upload-music-to-roblox-for-free-2021_GM431946152.pdf
    • http://opac.library.uib.ac.id/repository/coin-master-free-spins-ios_GM406889139.pdf
    • http://opac.library.uib.ac.id//repository/60-free-spins-coin-master_GM406889139.pdf
    • http://opac.library.uib.ac.id/repository/pubg-uc-2021_GM1330123889.pdf
    • http://opac.library.uib.ac.id/repository/minecraft-apk-114-4_GM479516143.pdf
    • http://opac.library.uib.ac.id//repository/how-to-get-free-unlimited-robux_GM431946152.pdf
    • http://opac.library.uib.ac.id/repository/coin-master-free-spins-app-android_GM406889139.pdf
    • http://opac.library.uib.ac.id/repository/dominus-roblox-free_GM431946152.pdf
    • http://opac.library.uib.ac.id//repository/coin-master-free-attack-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003230.bin
191d16f8748c2da3ccf14676f245f0219856919419b22704ed4c98c3285d3eb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3230 23428 bytes
font_01_sfnt_off000066f5.bin
2aa9052e4078dfdf09f927976bfd3cf76f1a678b4d9b3ecd6888c6d9efbc292b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66F5 18976 bytes

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