Malicious PDF — malware analysis report

Static analysis result for SHA-256 92cbd293cce8a8e0…

MALICIOUS

PDF

43.6 KB Created: 2021-05-19 05:37:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: aab39dbbba48cdb8125da6295b4a7da2 SHA-1: b6d75f6115c0a192f25224dd106ed0b2131573f1 SHA-256: 92cbd293cce8a8e08d8112ca7c4dbcfa503b6257b4e3ede989f0d062ea411c60
142 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are related to game cheats and hacks, indicating a link farm or phishing attempt. The presence of a fake CAPTCHA heuristic further suggests a user interaction lure designed to trick the user into clicking malicious links or downloading further payloads. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/how-to-cheat-in-roblox-game-hack
    • http://learningarabic.co.uk/images/coin-master-cheat-apk-free-download_GM406889139.pdf
    • http://learningarabic.co.uk/images/www-roblox-com-free-robux_GM431946152.pdf
    • http://learningarabic.co.uk/images/coin-master-fan-page-free-spins_GM406889139.pdf
    • http://learningarabic.co.uk/images/get-free-robux-com_GM431946152.pdf
    • http://learningarabic.co.uk/images/blox-world-free-robux_GM431946152.pdf
    • http://learningarabic.co.uk/images/coin-master-game-android-free-download_GM406889139.pdf
    • http://learningarabic.co.uk/images/robux-no-human-verification_GM431946152.pdf
    • http://learningarabic.co.uk/images/how-to-get-roblox-premium-for-free-2021_GM431946152.pdf
    • http://learningarabic.co.uk/images/spin-rewards-coin-master_GM406889139.pdf
    • http://learningarabic.co.uk/images/coin-master-hack-apk-2021-ios_GM406889139.pdf
    • http://learningarabic.co.uk/images/free-robux-no-verification_GM431946152.pdf
    • http://learningarabic.co.uk/images/get-free-spins-coin-master-2021_GM406889139.pdf
    • http://learningarabic.co.uk/images/earn-rbx_GM431946152.pdf
    • http://learningarabic.co.uk/images/free-robux-no-gift-card_GM431946152.pdf
    • http://learningarabic.co.uk/images/coin-master-free-spins-2021-haktuts_GM406889139.pdf
    • http://learningarabic.co.uk/images/all-free-items-in-roblox_GM431946152.pdf
    • http://learningarabic.co.uk/images/coin-master-free-spins-link-october-2021_GM406889139.pdf
    • http://learningarabic.co.uk/images/coin-master-32-hack-apk-download_GM406889139.pdf
    • http://learningarabic.co.uk/images/free-face-roblox_GM431946152.pdf
    • http://learningarabic.co.uk/images/how-to-get-free-robux-without-human-verification_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a25.bin
8029f8b674fd5b0b6727e75c905951bd24b532d647b1e9c3e7735f75b7d00cce		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A25 26944 bytes
font_01_sfnt_off000087a9.bin
65eb2ce946b42b9693923625c6007c764d2c4894e4322c6b46746fa0e9d37ece		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87A9 18448 bytes

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