Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbec0daf079d075b…

MALICIOUS

PDF

42.8 KB Created: 2021-05-17 08:53:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6a28cfd99e320937ab17a3136a453cec SHA-1: a9b0a3c695b2637f6f27eefddd05e590e6ce7d4e SHA-256: cbec0daf079d075bf19fdc0859d8c74d08f6a72a21f976eedbd6fcbf9c29508c
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA lure to trick users into clicking a link for 'free Robux'. The embedded URL, https://netcdn.xyz/app/431946152/free-robux-no-human-verification-2021-game-hack, is likely malicious and serves as the primary destination for this social engineering attempt. While no scripts were explicitly extracted, the PDF structure and heuristics indicate an attempt to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/free-robux-no-human-verification-2021-game-hack
    • http://www.thalanghospital.go.th/UserFiles/File/coin-master-apk-mod_GM406889139.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/hack-coin-master-iphone_GM406889139.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/minecraft-images-free_GM479516143.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/roblox-hack-scripts-pastebin_GM431946152.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/minecraft-skins-free-girl_GM479516143.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/coin-master-free-spin-and-coins-links-2021_GM406889139.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/free-robux-generator-2021_GM431946152.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/coin-master-free_GM406889139.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/coin-master-free-spins-app_GM406889139.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/vip-roblox-free_GM431946152.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/try-minecraft-free_GM479516143.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/daily-free-spins-coin-master-heaven_GM406889139.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/coin-master-hack-ios_GM406889139.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/buy-robux-free_GM431946152.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/roblox-skins-boy-free_GM431946152.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/free-robux-pastebin_GM431946152.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/coin-master-free-spins-link-2021-no-verification_GM406889139.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/prison-life-roblox-hacks_GM431946152.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/how-to-get-free-robux-easy-on-phone_GM431946152.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/cute-free-hair-on-roblox_GM431946152.pdf
    • https://www.roblox.co
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000476b.bin
49bfa39417d3869b083ee95c47636478c4924c16a82077842c521e7f08f5f860		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x476B 26536 bytes
font_01_sfnt_off000081ff.bin
6a9b2633b50d097f4b127a07737bc979a0fc1726e0f4efc9f53c1be2676c3116		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81FF 19260 bytes

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