Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b29045b9f93f2ab…

MALICIOUS

PDF

42.1 KB Created: 2021-05-12 01:34:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8112c113dae90fd24eaf173267b3b0a9 SHA-1: b85c13f26cec523e1eb08ba64ca1815a8897efc8 SHA-256: 4b29045b9f93f2abd79894176c255b6f9f0bd3e4f6b49d96ed682e6caf8769f3
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The document contains a fake CAPTCHA lure, a common social engineering tactic to trick users into interacting with malicious content. It also embeds multiple URLs, including one pointing to 'free-robux-without-verification-2021-game-hack', suggesting a scam or phishing attempt. The ML classifier also flagged this PDF as malicious with high confidence.

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-without-verification-2021-game-hack
    • http://solidcom.ch/images/free-spin-coin-master-game_GM406889139.pdf
    • http://solidcom.ch/images/wwwcoin-master-hack-apk_GM406889139.pdf
    • http://solidcom.ch/images/what-is-a-minecraft-client_GM479516143.pdf
    • http://solidcom.ch/images/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdf
    • http://solidcom.ch/images/bux-gg-robux-free_GM431946152.pdf
    • http://solidcom.ch/images/hack-coin-master-game-download_GM406889139.pdf
    • http://solidcom.ch/images/rbxcity-free-robux_GM431946152.pdf
    • http://solidcom.ch/images/minecraft-java-hacks_GM479516143.pdf
    • http://solidcom.ch/images/minecraft-ios-mods_GM479516143.pdf
    • http://solidcom.ch/images/get-free-robux-generator_GM431946152.pdf
    • http://solidcom.ch/images/coin-master-hack-progamers_GM406889139.pdf
    • http://solidcom.ch/images/roblox-studio-free-robux_GM431946152.pdf
    • http://solidcom.ch/images/coin-master-free-spins_GM406889139.pdf
    • http://solidcom.ch/images/coin-master-hack-ios-12_GM406889139.pdf
    • http://solidcom.ch/images/who-to-get-free-robux_GM431946152.pdf
    • http://solidcom.ch/images/was-minecraft-ever-free_GM479516143.pdf
    • http://solidcom.ch/images/how-to-make-free-robux_GM431946152.pdf
    • http://solidcom.ch/images/easy-how-to-get-free-robux_GM431946152.pdf
    • http://solidcom.ch/images/coin-master-free-coins-and-spins-2021_GM406889139.pdf
    • http://solidcom.ch/images/how-to-get-minecraft-for-free-on-xbox_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004720.bin
bf6ea96075ee2a914b9e97c244a877ccff9edc499fc8f91331616c91190b8649		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4720 24700 bytes
font_01_sfnt_off00007ef2.bin
a82984a519d7edf94c6531cfcf7f8df3cbe602e214b877051ae5dee029c294bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF2 19368 bytes

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