Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdbdfebe08938171…

MALICIOUS

PDF

49.0 KB Created: 2021-06-08 23:03:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7dda7f5758d6a613cb41e11c4faae82e SHA-1: 6112f700b7f5be29479f7a10b6b5b0c9233cb0ae SHA-256: bdbdfebe08938171741346b7cbd8c4799c1b3e80a75c2b1c76f620f4b1a8c724
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA and download lure related to Roblox hacking scripts, aiming to trick users into clicking malicious links. The ML classifier strongly flagged this PDF as malicious, and the embedded URLs point to suspicious domains. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to lead the user to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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-lego-hacking-script-game-hack
    • https://www.emcladder.com/uploaded_files/userfiles/files/how-to-get-robux-for-free-for-kids_GM431946152.pdf
    • https://www.emcladder.com/uploaded_files/userfiles/files/how-to-hack-roblox-every-day_GM431946152.pdf
    • https://www.emcladder.com/uploaded_files/userfiles/files/how-to-get-free-robux-no-human-verification-2021-pc_GM431946152.pdf
    • https://www.emcladder.com/uploaded_files/userfiles/files/roblox-jailbreak-mobile-cheat_GM431946152.pdf
    • https://www.emcladder.com/uploaded_files/userfiles/files/roblox-free-wings_GM431946152.pdf
    • https://www.emcladder.com/uploaded_files/userfiles/files/free-vip-accounts-roblox_GM431946152.pdf
    • https://www.emcladder.com/uploaded_files/userfiles/files/h-free-robux_GM431946152.pdf
    • https://www.emcladder.com/uploaded_files/userfiles/files/roblox-hack-free-robux-script_GM431946152.pdf
    • https://www.emcladder.com/uploaded_files/userfiles/files/roblox-crash-server-hack-script_GM431946152.pdf
    • https://www.emcladder.com/uploaded_files/userfiles/files/hack-for-maze-runner-roblox-exit_GM431946152.pdf
    • https://www.emcladder.com/uploaded_files/userfiles/files/free-robux-and-premuim_GM431946152.pdf
    • https://www.emcladder.com/uploaded_files/userfiles/files/hacks-on-roblox-grand-theft-auto_GM431946152.pdf
    • https://www.emcladder.com/uploaded_files/userfiles/files/robux-hack-online-no-human-verification_GM431946152.pdf
    • https://www.emcladder.com/uploaded_files/userfiles/files/does-roblox-ban-people-for-hacking_GM431946152.pdf
    • https://www.emcladder.com/uploaded_files/userfiles/files/roblox-jailbreak-hack-com_GM431946152.pdf
    • https://www.emcladder.com/uploaded_files/userfiles/files/roblox-hackeado-2021_GM431946152.pdf
    • https://www.emcladder.com/uploaded_files/userfiles/files/como-hackear-robux-en-roblox-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f61.bin
984cc8b3fdcada704eb154d56f1af8f928ff8549c26e5139e92a95dd69be6e4f
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F61 28444 bytes
font_01_sfnt_off0000917a.bin
bd082aa73fbb1a8b3bd2e5c998d3d8e31d1dfc71ea36f846af746f69a0d2ab7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x917A 2824 bytes
font_02_sfnt_off00009b2e.bin
af3b91a2921bd15cedda9a2af5784d5612ccb1b568f160cb1d7828ae3cb90ca3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B2E 18872 bytes