Malicious PDF — malware analysis report

Static analysis result for SHA-256 495e05b53dd12fab…

MALICIOUS

PDF

46.4 KB Created: 2021-05-17 08:30:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 52774a17934aa08b6fa8887ecb5c9784 SHA-1: c63ff855fd66b8b05e5bca4febab33a340480e95 SHA-256: 495e05b53dd12fab70057c348a69de88fa82ef1af2e0e5d248e4afae72d890a1
102 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, a common lure to trick users into clicking malicious links. The embedded URL points to a resource that claims to offer free Robux, further reinforcing the phishing pretext. The document's content and heuristics suggest it's designed to lead the user to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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-get-free-robux-without-human-verification-2021-game-hack
    • http://unionmusicaldebenidorm.com/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdf
    • http://unionmusicaldebenidorm.com/images/coin-master-free-spins-iphone-2021_GM406889139.pdf
    • http://unionmusicaldebenidorm.com/images/coin-master-hack-without-verification_GM406889139.pdf
    • http://unionmusicaldebenidorm.com/images/minecraft-windows-10-edition-free-download_GM479516143.pdf
    • http://unionmusicaldebenidorm.com/images/free-coin-and-spin-for-coin-master_GM406889139.pdf
    • http://unionmusicaldebenidorm.com/images/coin-master-hack-2021-apk_GM406889139.pdf
    • http://unionmusicaldebenidorm.com/images/coin-master-hack-apk-april-12-2021_GM406889139.pdf
    • http://unionmusicaldebenidorm.com/images/rbx-gg-free-robux_GM431946152.pdf
    • http://unionmusicaldebenidorm.com/images/how-to-free-robux_GM431946152.pdf
    • http://unionmusicaldebenidorm.com/images/minecraft-pe-hacks_GM479516143.pdf
    • http://unionmusicaldebenidorm.com/images/free-roblox-script-executor_GM431946152.pdf
    • http://unionmusicaldebenidorm.com/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://unionmusicaldebenidorm.com/images/free-daily-spins-coin-master_GM406889139.pdf
    • http://unionmusicaldebenidorm.com/images/daily-free-spins_GM406889139.pdf
    • http://unionmusicaldebenidorm.com/images/coin-master-free-spins-for-today_GM406889139.pdf
    • http://unionmusicaldebenidorm.com/images/free-roblox-generator-for-roblox_GM431946152.pdf
    • http://unionmusicaldebenidorm.com/images/free-robux-instantly_GM431946152.pdf
    • http://unionmusicaldebenidorm.com/images/free-spins-promo-code-for-coin-master_GM406889139.pdf
    • http://unionmusicaldebenidorm.com/images/minecraft-114-4-download-free_GM479516143.pdf
    • http://unionmusicaldebenidorm.com/images/coin-master-shield-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d80.bin
87b0cac273abf23f69a4ea5f0b85b6a4313bf434f70836b0df454634c279bc3f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D80 29084 bytes
font_01_sfnt_off00008ee5.bin
2fcc096d095577e17bc813bca386b7e419c64e6aba5a370ab2124621dd0af6c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EE5 19792 bytes

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