Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a56f7632c5a5a8…

MALICIOUS

PDF

33.8 KB Created: 2021-07-19 10:51:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a63c31a0dfd8bd16c40a2dcc53cfd647 SHA-1: cf096ad0d8f1b346999a9672ac8ea979bcf1c4b3 SHA-256: a4a56f7632c5a5a88b62721fc3dea7b486abe8a8cc21981fbdaa28f0a0b7840b
82 Risk Score

Malware Insights

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

This PDF document employs a lure of a "Free Robux Generator" and presents a fake CAPTCHA to trick the user into interacting with malicious links. The embedded URLs and document content strongly suggest a phishing or scam attempt designed to lead users to download further malicious content or compromise their accounts. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 http://netcdn.tw/app/431946152/free-robux-generator-for-kids-game-hack
    • http://krumerhaus.at/images/free-robux-come_GM431946152.pdf
    • http://krumerhaus.at/images/free-robux-codes-2021_GM431946152.pdf
    • http://krumerhaus.at/images/how-to-get-minecraft-bedrock-for-free_GM479516143.pdf
    • http://krumerhaus.at/images/minecraft-java-edition-free-trial_GM479516143.pdf
    • http://krumerhaus.at/images/minecraft-realms-free_GM479516143.pdf
    • http://krumerhaus.at/images/how-to-play-minecraft-for-free-on-pc_GM479516143.pdf
    • http://krumerhaus.at/images/how-to-hack-a-roblox-account-easy_GM431946152.pdf
    • http://krumerhaus.at/images/how-to-get-free-likes-on-tiktok_GM835599320.pdf
    • http://krumerhaus.at/images/roblox-jailbreak-hack_GM431946152.pdf
    • http://krumerhaus.at/images/how-to-hack-minecraft_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002c73.bin
4c718051cca43f21b8bfb91442525cae0cd2f5001a1e7656005a03d6f5fc462f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2C73 23088 bytes
font_01_sfnt_off0000606e.bin
4cbd0ae17372b8e997376decb208b799e75d96359c1fbbc6a9a72339bd757eb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x606E 18828 bytes

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