Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd26fdea28399e8…

MALICIOUS

PDF

57.9 KB Created: 2021-06-11 06:01:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d3e557502d7eb4548018c62ace1def6c SHA-1: bcf6f037f2b21acf8e49eb986b9829db6680e577 SHA-256: dfd26fdea28399e88624a52e4f47e5594e5ae4dd8e8765df4f050b3b113c7066
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 clicking a link. The embedded URL, https://netcdn.tw/app/431946152/click-here-to-get-free-robux-game-hack, is likely used to download a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9611

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/click-here-to-get-free-robux-game-hack
    • https://www.e-learning-manberau.com/__statics/gudangsoal/files/minecraft-windows-10-edition-free_GM479516143.pdf
    • https://www.e-learning-manberau.com/__statics/gudangsoal/files/getrobux-ninja_GM431946152.pdf
    • https://www.e-learning-manberau.com/__statics/gudangsoal/files/mcpe-master-hack-coin-apk_GM406889139.pdf
    • https://www.e-learning-manberau.com/__statics/gudangsoal/files/real-free-spins-for-coin-master_GM406889139.pdf
    • https://www.e-learning-manberau.com/__statics/gudangsoal/files/roblox-com-free-accounts_GM431946152.pdf
    • https://www.e-learning-manberau.com/__statics/gudangsoal/files/wwwcoin-master-hack-apk_GM406889139.pdf
    • https://www.e-learning-manberau.com/__statics/gudangsoal/files/how-to-get-free-tiktok-likes_GM835599320.pdf
    • https://www.e-learning-manberau.com/__statics/gudangsoal/files/roblox-how-to-get-vip-for-free_GM431946152.pdf
    • https://www.e-learning-manberau.com/__statics/gudangsoal/files/coin-master-hack-without-human-verification-2021_GM406889139.pdf
    • https://www.e-learning-manberau.com/__statics/gudangsoal/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdf
    • https://www.e-learning-manberau.com/__statics/gudangsoal/files/free-robux-no-email_GM431946152.pdf
    • https://www.e-learning-manberau.com/__statics/gudangsoal/files/free-robux-working_GM431946152.pdf
    • https://www.e-learning-manberau.com/__statics/gudangsoal/files/roblox-cheat-codes-sift_GM431946152.pdf
    • https://www.e-learning-manberau.com/__statics/gudangsoal/files/roblox-hacks-com_GM431946152.pdf
    • https://www.e-learning-manberau.com/__statics/gudangsoal/files/hack-coin-master-game_GM406889139.pdf
    • https://www.e-learning-manberau.com/__statics/gudangsoal/files/free-dominus-roblox_GM431946152.pdf
    • https://www.e-learning-manberau.com/__statics/gudangsoal/files/how-to-use-redstone_GM479516143.pdf
    • https://www.e-learning-manberau.com/__statics/gudangsoal/files/coin-master-hack-pc_GM406889139.pdf
    • https://www.e-learning-manberau.com/__statics/gudangsoal/files/free-robux-gift-card-codes-2021_GM431946152.pdf
    • https://www.e-learning-manberau.com/__statics/gudangsoal/files/free-robux-games-that-actually-work-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000558e.bin
2a48faf8cea3292aee966f2af3c3d86bd6a15647ce9ad8145847497788a0b2bf		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x558E 29976 bytes
font_01_sfnt_off00009a79.bin
0b188308ab0e7ffce9913d63d697a586f2937cafc51a771db38e3a566cd37e24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A79 7420 bytes
font_02_sfnt_off0000b2e4.bin
9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E4 5596 bytes
font_03_sfnt_off0000bf8c.bin
c57ad1690434184de1eb37ea7cd6cb3a9eb03be661a62db910b348a818f4a114		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8C 18480 bytes

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