Malicious PDF — malware analysis report

Static analysis result for SHA-256 949507d44d9e6a13…

MALICIOUS

PDF

47.1 KB Created: 2021-06-03 11:51:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 82716011a420e8abaf81da7fd48b8d1a SHA-1: fd3fee56c4da0ee823dd2c4eeaf23224a9217925 SHA-256: 949507d44d9e6a1335973cc31e2a858042536094001e36d601919dc0f9ad2350
82 Risk Score

Malware Insights

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

The PDF document displays a fake CAPTCHA or human verification prompt to trick users into downloading additional files. The embedded URLs suggest a lure related to game hacks and free in-game currency, which is a common social engineering tactic. While no scripts were directly extracted, the ML classifier and the presence of external URIs indicate malicious intent, likely leading to the download and execution of further payloads.

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.online/app/406889139/free-spins-on-coin-master-game-hack
    • https://ifef.es/ckfinder/userfiles/files/minecraft-survival-free_GM479516143.pdf
    • https://ifef.es/ckfinder/userfiles/files/withdraw-robux_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-to-buy-robux-for-free_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/roblox-fly-hack_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-robux-gift-card-codes_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/pokemon-go-free-lucky-egg_GM1094591345.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-custom-minecraft-skins_GM479516143.pdf
    • https://ifef.es/ckfinder/userfiles/files/master-coin-hack-app_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/tower-of-hell-roblox-hack_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/minecraft-multiplayer-free_GM479516143.pdf
    • https://ifef.es/ckfinder/userfiles/files/best-free-robux-sites_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/rbx-roblox_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/rbx-gg-free-robux_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-to-get-free-robux-games_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/infinite-robux_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/daily-free-spin-coin-master-link_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-tiktok-like_GM835599320.pdf
    • https://ifef.es/ckfinder/userfiles/files/tiktok-free-online-unblocked_GM835599320.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-modded-minecraft-server-hosting_GM479516143.pdf
    • https://ifef.es/ckfinder/userfiles/files/minecraft-wurst_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005045.bin
f4389477fb0f2378ade4d304dfb7e67a324be08bcf58dc910b5401085fc2c554
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5045 25412 bytes
font_01_sfnt_off00008b8d.bin
4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B8D 3400 bytes
font_02_sfnt_off000096b7.bin
addbd5428a422ca7211e94293fed3a4f98c85d5f6337328d4d3623e90d90c649
pdf-font-stream PDF embedded font (sfnt) at offset 0x96B7 17884 bytes