Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73357d76c8d4617…

MALICIOUS

PDF

47.3 KB Created: 2021-06-11 08:45:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0f56dc81e437107e14fa07eab600d54e SHA-1: 74f17e3962974fe4baaba0f0ee3cf123ce9a0a4d SHA-256: b73357d76c8d461717e8edbd36e083a5972a6f177bb0bde65acec676c6b796cf
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The document displays a fake CAPTCHA or human verification prompt, a common lure to trick users into interacting with malicious content. It also contains an external URI pointing to a suspicious URL, likely intended to host a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 5

  • 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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/prison-break-hack-script-roblox-game-hack
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/minecraft-pe-free-ios_GM479516143.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/minecraft-realms-free-codes_GM479516143.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/hack-robux-gratis-como-tener-robux-gratis-2021_GM431946152.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/how-to-hack-roblox-accounts-2021_GM431946152.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/join-this-roblox-group-for-free-robux_GM431946152.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/how-to-get-free-robux-on-a-game_GM431946152.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/how-to-hack-roblox-to-get-robux_GM431946152.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/how-to-get-free-robux-2021_GM431946152.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/minecraft-launcher-free_GM479516143.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/how-can-i-get-free-robux_GM431946152.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/free-minecraft-server_GM479516143.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/hack-de-game-pass-para-horse-world-roblox_GM431946152.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/roblox-jailbreak-money-hack-2021-download_GM431946152.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/free-minecraft-java-edition_GM479516143.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/free-robux-hacker-us_GM431946152.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/minecraft-free-android_GM479516143.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/minecraft-free-download-android_GM479516143.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/free-coin-master-coins_GM406889139.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/roblox-hack-site-android_GM431946152.pdf
    • http://elearning.mamduh.my.id/__statics/gudangsoal/files/robux-hack-pastebin-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f1d.bin
723550eef5104a1385d3b82cd3f9c97add307671cf11468c0841ac919162d429		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F1D 25708 bytes
font_01_sfnt_off00008ab7.bin
a11247a8a9a886589a9bc086a7a230481df2dc5a341c718e79df078095cade05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AB7 2892 bytes
font_02_sfnt_off000094bb.bin
4de41c8831638c928701d2f824d0f7fc87b15dc2c85863c6f0433eca1ff44a46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94BB 18736 bytes

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