Malicious PDF — malware analysis report

Static analysis result for SHA-256 f122035a4c9bba49…

MALICIOUS

PDF

45.5 KB Created: 2021-06-01 12:21:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4d06d54c43c68c844c247db368c79afd SHA-1: 70ccbc95d8875eb7ce1487094fdd43dfe601ef6b SHA-256: f122035a4c9bba4971c053ea8993ef85c8f2be7751417a5d4b313bd287851568
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document presents a fake CAPTCHA to trick the user into interacting with it, likely to initiate a download. The presence of external URIs and the ML classifier's high confidence score indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lead the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/how-to-speed-hack-with-bitslicer-on-roblox-game-hack
    • https://www.rse-annuaire.net/wp-content/uploads/fsqm-files/how-to-fly-hack-in-sword-simulator-roblox_GM431946152.pdf
    • https://www.rse-annuaire.net/wp-content/uploads/fsqm-files/kill-all-roblox-hack-script_GM431946152.pdf
    • https://www.rse-annuaire.net/wp-content/uploads/fsqm-files/minecraft-ps4-free_GM479516143.pdf
    • https://www.rse-annuaire.net/wp-content/uploads/fsqm-files/rblx-gg-free-robux_GM431946152.pdf
    • https://www.rse-annuaire.net/wp-content/uploads/fsqm-files/coin-master-free-spin-link-today-2021_GM406889139.pdf
    • https://www.rse-annuaire.net/wp-content/uploads/fsqm-files/roblox-mobile-hack_GM431946152.pdf
    • https://www.rse-annuaire.net/wp-content/uploads/fsqm-files/what-roblox-is-good-about-hacked-account_GM431946152.pdf
    • https://www.rse-annuaire.net/wp-content/uploads/fsqm-files/hack-injector-roblox-2021_GM431946152.pdf
    • https://www.rse-annuaire.net/wp-content/uploads/fsqm-files/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdf
    • https://www.rse-annuaire.net/wp-content/uploads/fsqm-files/how-to-get-free-robux-on-mobile_GM431946152.pdf
    • https://www.rse-annuaire.net/wp-content/uploads/fsqm-files/how-to-get-free-admin-on-roblox-pastebin_GM431946152.pdf
    • https://www.rse-annuaire.net/wp-content/uploads/fsqm-files/free-robux-card-codes_GM431946152.pdf
    • https://www.rse-annuaire.net/wp-content/uploads/fsqm-files/how-to-download-roblox-on-xbox-360-for-free_GM431946152.pdf
    • https://www.rse-annuaire.net/wp-content/uploads/fsqm-files/free-spin-link-for-coin-master-game_GM406889139.pdf
    • https://www.rse-annuaire.net/wp-content/uploads/fsqm-files/free-robux-roblox-promo-codes_GM431946152.pdf
    • https://www.rse-annuaire.net/wp-content/uploads/fsqm-files/how-to-get-minecraft-for-free-on-phone_GM479516143.pdf
    • https://www.rse-annuaire.net/wp-content/uploads/fsqm-files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdf
    • https://www.rse-annuaire.net/wp-content/uploads/fsqm-files/free-robux-no-verification_GM431946152.pdf
    • https://www.rse-annuaire.net/wp-content/uploads/fsqm-files/roblox-world-free-robux_GM431946152.pdf
    • https://www.rse-annuaire.net/wp-content/uploads/fsqm-files/how-to-hack-to-get-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000544b.bin
fbccb1bfd12754edf9debc5636fb6adda41b8fc42b3c934a4592e4807150057c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x544B 24532 bytes
font_01_sfnt_off00008c6a.bin
858a4ae876476a7565f208188efae19c36d5739a59f92c2ac6423ad67ded7972		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C6A 19284 bytes

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