Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d738e856146dd8d…

MALICIOUS

PDF

43.7 KB Created: 2021-05-14 08:10:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 60260a96f44c862a4e6a9fc1c11698cb SHA-1: 623a2105c10ce7e85a4f48321baebbe74ae4765a SHA-256: 4d738e856146dd8d370fb4f36a82903c986be6a7ef5152c6f9270eb4a4c30bbc
102 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt, a common lure for users seeking game hacks or free in-game currency. It contains numerous embedded URLs, including one pointing to 'how-to-get-free-robux-youtube-game-hack', strongly suggesting a phishing or scam attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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-youtube-game-hack
    • https://www.mpos-organs.com/uploads/files/files/coin-master-free-cards-link-2021_GM406889139.pdf
    • https://www.mpos-organs.com/uploads/files/files/does-coin-master-hack-work_GM406889139.pdf
    • https://www.mpos-organs.com/uploads/files/files/free-spin-and-win-coin-master_GM406889139.pdf
    • https://www.mpos-organs.com/uploads/files/files/create-minecraft-server-free_GM479516143.pdf
    • https://www.mpos-organs.com/uploads/files/files/coin-master-hack-pro-gamers-com_GM406889139.pdf
    • https://www.mpos-organs.com/uploads/files/files/minecraft-online-free-download_GM479516143.pdf
    • https://www.mpos-organs.com/uploads/files/files/gamesofficenet-hack-coin-master_GM406889139.pdf
    • https://www.mpos-organs.com/uploads/files/files/robux-free-2021_GM431946152.pdf
    • https://www.mpos-organs.com/uploads/files/files/roblox-script-hacks_GM431946152.pdf
    • https://www.mpos-organs.com/uploads/files/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • https://www.mpos-organs.com/uploads/files/files/how-do-you-get-roblox-for-free_GM431946152.pdf
    • https://www.mpos-organs.com/uploads/files/files/how-to-get-free-robux-hack-2021_GM431946152.pdf
    • https://www.mpos-organs.com/uploads/files/files/coin-master-hack-https-coinms-net_GM406889139.pdf
    • https://www.mpos-organs.com/uploads/files/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdf
    • https://www.mpos-organs.com/uploads/files/files/how-do-you-install-minecraft-for-free_GM479516143.pdf
    • https://www.mpos-organs.com/uploads/files/files/coin-master-free-spin-link-today-16-11-2021_GM406889139.pdf
    • https://www.mpos-organs.com/uploads/files/files/coinmaster-hack_GM406889139.pdf
    • https://www.mpos-organs.com/uploads/files/files/minecraft-free-minecoins_GM479516143.pdf
    • https://www.mpos-organs.com/uploads/files/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdf
    • https://www.mpos-organs.com/uploads/files/files/try-coin-master-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bd0.bin
899c7dfba55d3178d5c860be76b14bb4ba42e1880762c315e6ef7e8522f82b91		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BD0 25700 bytes
font_01_sfnt_off000087de.bin
c8869677d4d84c4518e8410e1128de6ae04a76f8db213e07b668dd1668cda2fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87DE 18444 bytes

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