Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb004b4b912fbb8…

MALICIOUS

PDF

34.8 KB Created: 2021-05-23 21:39:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 558cf2c6b1e0a7b89febc572452bf832 SHA-1: f7922807fee53af295ba4e78d46c842c06449c85 SHA-256: 8cb004b4b912fbb80da109d775ef37db38e754301019d94ba3bc65127df6731c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document displays a fake CAPTCHA and a call-to-action button, aiming to trick the user into clicking a link. This link, 'https://netcdn.xyz/app/835599320/tiktok-free-fans-game-hack', likely leads to a malicious website or a further download. The presence of multiple similar URLs suggests a campaign distributing lures for various online games and services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/835599320/tiktok-free-fans-game-hack
    • https://europe-upkl.eu/images/get-free-likes-on-tiktok_GM835599320.pdf
    • https://europe-upkl.eu/images/coin-master-free-spins-hack_GM406889139.pdf
    • https://europe-upkl.eu/images/roblox-studio-free-robux_GM431946152.pdf
    • https://europe-upkl.eu/images/coin-master-hack-apk-2021_GM406889139.pdf
    • https://europe-upkl.eu/images/easy-how-to-get-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000308f.bin
434c40703e064e5af6a269968de28497b314f564d6d4418c0e97e5b3911ec8fa		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x308F 24268 bytes
font_01_sfnt_off00006876.bin
4a9e05c682d6810de0feb86162fa18badead57ff55ae6cc117977f414faa10b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6876 17684 bytes

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