Malicious PDF — malware analysis report

Static analysis result for SHA-256 321ecfd926451cd4…

MALICIOUS

PDF

36.2 KB Created: 2021-07-05 11:13:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6a5a78cea85bb5906c49b4baded2862e SHA-1: 56433786a68f83eb060da066a1d0165ab07aa3b1 SHA-256: 321ecfd926451cd470b730448bc6f1f5b9961471a1d357fe85e895af94ed9430
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with a malicious link. The primary external URI points to 'netcdn.tw', which is highly suspicious. This suggests a social engineering attack aiming to deliver a secondary payload or lead the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/is-roblox-free-on-nintendo-switch-game-hack
    • http://www.library.gkigadingserpong.org/repository/free-spin-link-for-coin-master-game_GM406889139.pdf
    • http://library.gkigadingserpong.org/repository/coin-master-hack-to-get-free-spins_GM406889139.pdf
    • http://library.gkigadingserpong.org/repository/free-roblox-cards-pin-number-2021_GM431946152.pdf
    • http://library.gkigadingserpong.org/repository/roblox-promo-codes-for-free-robux_GM431946152.pdf
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spins-today-daily-links_GM406889139.pdf
    • http://library.gkigadingserpong.org/repository/coin-master-free-stars_GM406889139.pdf
    • http://library.gkigadingserpong.org/repository/roblox-jailbreak-how-to-get-bugatti-for-free_GM431946152.pdf
    • http://library.gkigadingserpong.org/repository/how-to-get-hacks-on-minecraft_GM479516143.pdf
    • http://library.gkigadingserpong.org/repository/roblox-free-gift-cards-list_GM431946152.pdf
    • http://www.library.gkigadingserpong.org/repository/mcpe-optifine_GM479516143.pdf
    • http://www.library.gkigadingserpong.org/repository/best-site-for-free-coin-master-free-spin-link_GM406889139.pdf
    • http://www.library.gkigadingserpong.org/repository/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.pdf
    • http://www.library.gkigadingserpong.org/repository/coin-master-spin-hack-trick_GM406889139.pdf
    • http://library.gkigadingserpong.org/repository/free-holiday-crown-roblox_GM431946152.pdf
    • http://library.gkigadingserpong.org/repository/free-robux-codes-no-verification_GM431946152.pdf
    • http://library.gkigadingserpong.org/repository/how-to-get-free-golden-card-in-coin-master_GM406889139.pdf
    • http://library.gkigadingserpong.org/repository/minecraft-pocket-apk_GM479516143.pdf
    • http://www.library.gkigadingserpong.org/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdf
    • http://www.library.gkigadingserpong.org/repository/claim-free-robux-button-no-human-verification_GM431946152.pdf
    • http://library.gkigadingserpong.org/repository/check-cashed-cheat-engine-for-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000350b.bin
10ebebbb70d8377c3c98e05343633676c775398e6ca578191753951300abefba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x350B 22616 bytes
font_01_sfnt_off00006796.bin
207512dbd05d1b3c713ef1abc698c126202e51ea4af98bfb6c4cd126f0304229		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6796 19376 bytes

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