Malicious PDF — malware analysis report

Static analysis result for SHA-256 36040990d0f200a2…

MALICIOUS

PDF

46.9 KB Created: 2021-06-02 15:14:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 98d4ff1c280dc3fd1a2e12604cad2788 SHA-1: b2341fca8ec1a616f6697004bd7945d5221dadcb SHA-256: 36040990d0f200a21a8d10e4de64146ccbbcf8abf7168a3fd9a876b3111c72cb
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with it. It also contains an embedded URI pointing to a suspicious URL, likely intended 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 0.9769

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.xyz/app/431946152/free-robux-for-kids-under-18-game-hack
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/roblox-com-free_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/free-robux-no-survey_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/free-coins-for-coin-master_GM406889139.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/free-tiktok-followers-no-downloads_GM835599320.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/free-daily-spins-coin-master_GM406889139.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/free-robux-no-offers_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/best-free-roblox-outfits_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/free-robux-websites-2021_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/roblox-fun-com-free-robux_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/minecraft-bedrock-server-hosting-free_GM479516143.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/free-coins-and-spins-coin-master_GM406889139.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/free-spin-link-for-coin-master_GM406889139.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/how-to-download-minecraft-for-free-ios_GM479516143.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/how-do-u-get-free-robux_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/best-minecraft-hacked-client-2021_GM479516143.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/free-robux-websites-no-human-verification_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/roblox-hack-generator_GM431946152.pdf
    • http://elearning.mtsnlingga.sch.id/__statics/gudangsoal/files/is-there-a-way-to-get-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_off00005130.bin
b9f2557a8d810028fcdef89b7877c83ec4281f4c23139ca67e8a8754891ede56		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5130 24236 bytes
font_01_sfnt_off000088ca.bin
889cfc2fd0afa9ea114d6666204c6ce0548d0aae2cba345827d317498c4c06bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88CA 2984 bytes
font_02_sfnt_off000092f6.bin
c6c02157561c6d1c84cd0df301ca0e43dc63050157707586a549a9d02cf7cdad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92F6 18812 bytes

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