Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e5f4afc8866139…

MALICIOUS

PDF

44.8 KB Created: 2021-06-08 21:35:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1d64502d1b1b663e6efd2d3ed7c7e227 SHA-1: ad982b94a61002d2335f681191d97b31ba63df3e SHA-256: a5e5f4afc88661398b1f5b34ee6c29b19e57923e73fad0f9d52553aa503e7c79
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 or human verification prompt to trick the user into clicking a link. The embedded URL, https://netcdn.tw/app/431946152/free-robux-ashar-qaseem-game-hack, likely leads to a malicious site for further exploitation or payload delivery. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/free-robux-ashar-qaseem-game-hack
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/free-rare-cards-for-coin-master_GM406889139.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/coin-and-spin-link_GM406889139.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/roblox-free-exploits_GM431946152.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/coin-master-hack-no-survey_GM406889139.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/minecraft-server-free-trial_GM479516143.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/coin-master-hack-2021-ios_GM406889139.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/coin-master-time-hack_GM406889139.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/coin-master-hacks-that-actually-work_GM406889139.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/roblox-rewards-site_GM431946152.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/hack-pour-roblox-sur-rocitizens-pour-avoir-plein-d-argent_GM431946152.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/free-spins-coin-master-2021_GM406889139.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/free-spin-coin-master-hacktoman_GM406889139.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/real-coin-master-free-spins_GM406889139.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/coin-master-free-attack-link_GM406889139.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/robux-com-free_GM431946152.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/moonactive-coin-master-free-spins-link_GM406889139.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/how-to-get-free-food-for-foxy-in-coin-master_GM406889139.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/roblox-gift-card-for-free_GM431946152.pdf
    • https://elearning.manesa.sch.id/__statics/gudangsoal/files/how-to-get-free-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004fdd.bin
f6b3d4e4c8952f2328b7f7e8a68215a5d161586af466600e095f6c4ebbb67412		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FDD 26124 bytes
font_01_sfnt_off00008af5.bin
89365919bbaf58bd41176e312aa3deb0d619fbf754cca96cf71de31d5b629d71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF5 18824 bytes

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