Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a8a81ee65c0d7a…

MALICIOUS

PDF

50.8 KB Created: 2021-06-10 16:18:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: cba69447dc3e8278877bebf80b4c6b43 SHA-1: 2b6b6cf9af5e2e27b3817cff97b54338602ddd73 SHA-256: a0a8a81ee65c0d7ac51b66d5040a8ca3110d141dd42404f535dfd5dcc3a54038
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 interacting with it. It contains an embedded URI pointing to a URL that appears to be related to game hacks, suggesting a lure for downloading further malware. The ML classifier also flagged this PDF as malicious with a high score.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

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/roblox-free-ply-no-download-game-hack
    • https://www.elearning.man1bukittinggi.sch.id/__statics/gudangsoal/files/coin-master-free-blogspot_GM406889139.pdf
    • https://www.elearning.man1bukittinggi.sch.id/__statics/gudangsoal/files/master-coin-free_GM406889139.pdf
    • https://www.elearning.man1bukittinggi.sch.id/__statics/gudangsoal/files/how-to-get-free-roebucks-without-verification_GM431946152.pdf
    • https://www.elearning.man1bukittinggi.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-phone_GM431946152.pdf
    • https://www.elearning.man1bukittinggi.sch.id/__statics/gudangsoal/files/free-card-link-coin-master_GM406889139.pdf
    • https://www.elearning.man1bukittinggi.sch.id/__statics/gudangsoal/files/roblox-booga-booga-hack_GM431946152.pdf
    • https://elearning.man1bukittinggi.sch.id/__statics/gudangsoal/files/free-spins-coin-master-2021_GM406889139.pdf
    • https://elearning.man1bukittinggi.sch.id/__statics/gudangsoal/files/free-robux-no-survey_GM431946152.pdf
    • https://www.elearning.man1bukittinggi.sch.id/__statics/gudangsoal/files/roblox-hacks-2021_GM431946152.pdf
    • https://elearning.man1bukittinggi.sch.id/__statics/gudangsoal/files/free-robux-quiz_GM431946152.pdf
    • https://www.elearning.man1bukittinggi.sch.id/__statics/gudangsoal/files/how-to-hack-coin-master-android_GM406889139.pdf
    • https://www.elearning.man1bukittinggi.sch.id/__statics/gudangsoal/files/best-free-roblox-executor_GM431946152.pdf
    • https://www.elearning.man1bukittinggi.sch.id/__statics/gudangsoal/files/minecraft-java-edition-free-trial_GM479516143.pdf
    • https://elearning.man1bukittinggi.sch.id/__statics/gudangsoal/files/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdf
    • https://www.elearning.man1bukittinggi.sch.id/__statics/gudangsoal/files/coin-master-free-spin-link-daily_GM406889139.pdf
    • https://www.elearning.man1bukittinggi.sch.id/__statics/gudangsoal/files/free-robux-no-apps_GM431946152.pdf
    • https://elearning.man1bukittinggi.sch.id/__statics/gudangsoal/files/how-to-robux_GM431946152.pdf
    • https://www.elearning.man1bukittinggi.sch.id/__statics/gudangsoal/files/minecraft-that-you-can-play-for-free_GM479516143.pdf
    • https://www.elearning.man1bukittinggi.sch.id/__statics/gudangsoal/files/how-to-hack-coin-master_GM406889139.pdf
    • https://elearning.man1bukittinggi.sch.id/__statics/gudangsoal/files/lazy-blocks-com-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054de.bin
9c618bfb9386bab8c8cd3852c86f49b028fa1a21a3a6ace5f6c14d9b24cf74b7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54DE 27444 bytes
font_01_sfnt_off000094a9.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94A9 5696 bytes
font_02_sfnt_off0000a1bb.bin
79afaa39c4f6b21d8ce215f804dcd1a73be337e12aa573e3fc6feed36f915bc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1BB 19016 bytes

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