Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00ba9f095c7e919…

MALICIOUS

PDF

35.0 KB Created: 2021-07-09 02:27:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ae12db2f93fce6273b7305381ccd2bff SHA-1: c92325060b9c432a4b1af93526e52061c44024f8 SHA-256: a00ba9f095c7e91964e5e02640cd42aff2a89804cba3f89db5eafa1109d689b2
82 Risk Score

Malware Insights

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

The sample is a PDF document that displays a fake CAPTCHA to trick the user into interacting with it. It contains an embedded URI pointing to 'http://netcdn.tw/app/431946152/robux-free-robux-game-hack', which is likely a lure for downloading a secondary payload. The ML classifier also flagged this PDF as malicious with high confidence.

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/robux-free-robux-game-hack
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/how-to-hack-coin-master-apkmody_GM406889139.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/hack-coin-master-free_GM406889139.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/coin-master-hack-game_GM406889139.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/roblox-robux-secret-hacks_GM431946152.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/free-robux-cards_GM431946152.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-2021_GM406889139.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/hack-that-lets-you-join-full-servers-on-roblox_GM431946152.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/free-robux-generator-2021_GM431946152.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/roblox-robux-hack-no-survey-no-password_GM431946152.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/free-robux-codes-2021-not-used_GM431946152.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/how-to-get-100-free-spins-on-coin-master_GM406889139.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/free-robot-animation-roblox_GM431946152.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/free-2021-robux_GM431946152.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/vex0rmillion-hack-roblox_GM431946152.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/promo-code-free-robux_GM431946152.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/minecraft-ios-mods_GM479516143.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/free-roblox-dominus_GM431946152.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/hacking-roblox-non-fe_GM431946152.pdf
    • http://elearning.manulasem.sch.id/__statics/gudangsoal/files/roblox-super-hero-life-3-money-cheat_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000033ba.bin
cb5008f86381dec8e1835f9140d450cc840a383a99b538afaea2ca3ceaf72081		 pdf-font-stream PDF embedded font (sfnt) at offset 0x33BA 22100 bytes
font_01_sfnt_off000064a6.bin
776cb4e5338264d595c967a8fec9379201c9a4b17293b3c44edd5cf6cd499e31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A6 18716 bytes

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