Malicious PDF — malware analysis report

Static analysis result for SHA-256 57841c6b25c8d421…

MALICIOUS

PDF

46.8 KB Created: 2021-06-10 14:16:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7a8c4f1efcb57eecfe3e764fcd3b1849 SHA-1: ff67c9b935c60f9e00428a2a6f55e62ca673113f SHA-256: 57841c6b25c8d4219f4ed7487977b30fdaf9e5be9bb04f88355c9432807a27ef
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to trick the user into interacting with a malicious link. The embedded URL, https://netcdn.tw/app/431946152/roblox-meep-city-how-to-get-free-plus-game-hack, likely leads to a second-stage download. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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-meep-city-how-to-get-free-plus-game-hack
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/minecraft-story-mode-free_GM479516143.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-robux-100-real_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-spins-for-coin-master-app_GM406889139.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/get-tiktok-followers-free_GM835599320.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/saibling-roblox-hack-client_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-roblox-studio-boy-hair_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/rbx-fre-robux_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/minecraft-for-chromebook-free_GM479516143.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/hack-menu-roblox-jailbreak_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-robux-gift-card_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-robux-gift-card-codes-2021_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/roblox-hack-loaderexe_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-custom-script-runner-roblox_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-get-free-robux-100-legit_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/roblox-phantom-forces-free-money_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/can-i-change-my-roblox-username-for-free_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/2021-roblox-hack_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-robux-accounts_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/jeux-de-hacking-sur-roblox_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/yin-vs-yang-roblox-cheat_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000053c9.bin
5c8ea5f556a2f5818c025af350f55a4c7f5621943583426320fc1ba3c68fa8e7
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53C9 27336 bytes
font_01_sfnt_off00009215.bin
06a9fcd2ca9c37c28bb6e88f59ba8d87b4d25ab2b2259a6e8abc5cbe6219c468
pdf-font-stream PDF embedded font (sfnt) at offset 0x9215 19180 bytes