Malicious PDF — malware analysis report

Static analysis result for SHA-256 be842c7f983efea7…

MALICIOUS

PDF

42.6 KB Created: 2021-05-18 04:12:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1165fae6d36f6df02f8e91bdf3a52214 SHA-1: 61c4927896121592a8598b85e8a6f18da9ee6573 SHA-256: be842c7f983efea7b88551b01c9003485333f81b31facafe3ef480305699ed95
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure to trick users into clicking a link, which is a common social engineering tactic. The embedded URI points to a URL that likely hosts a second-stage payload. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/431946152/kuso-icu-roblox-hack-game-hack
    • http://kcpb51.ru/images/free-coins-for-planet-master-game_GM406889139.pdf
    • http://kcpb51.ru/images/free-robux-now_GM431946152.pdf
    • http://kcpb51.ru/images/coin-master-claim-spins_GM406889139.pdf
    • http://kcpb51.ru/images/can-you-hack-coin-master_GM406889139.pdf
    • http://kcpb51.ru/images/coin-master-hack-spins_GM406889139.pdf
    • http://kcpb51.ru/images/coin-master-100-spin_GM406889139.pdf
    • http://kcpb51.ru/images/how-to-get-free-robux-inspect_GM431946152.pdf
    • http://kcpb51.ru/images/roblox-free-models_GM431946152.pdf
    • http://kcpb51.ru/images/how-to-hack-any-roblox-account_GM431946152.pdf
    • http://kcpb51.ru/images/roblox-free-pets_GM431946152.pdf
    • http://kcpb51.ru/images/minecraft-bedrock-server-hosting-free_GM479516143.pdf
    • http://kcpb51.ru/images/roblox-free-clothes-girl_GM431946152.pdf
    • http://kcpb51.ru/images/haktuts-coin-master-free-daily-spins_GM406889139.pdf
    • http://kcpb51.ru/images/free-robux-generator-no-survey_GM431946152.pdf
    • http://kcpb51.ru/images/how-to-hack-roblox-to-get-robux_GM431946152.pdf
    • http://kcpb51.ru/images/coin-master-hack-download-2021_GM406889139.pdf
    • http://kcpb51.ru/images/how-to-hack-and-get-free-robux_GM431946152.pdf
    • http://kcpb51.ru/images/how-to-hack-coin-master-game-ios_GM406889139.pdf
    • http://kcpb51.ru/images/free-spins-coin-master-links-2021_GM406889139.pdf
    • http://kcpb51.ru/images/free-unlimited-robux_GM431946152.pdf
    • https://www.mic
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000046c0.bin
d11e9959861c1016406ecd3733b80830ec1fe5427f53712f32f391e2ff37616d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46C0 26784 bytes
font_01_sfnt_off0000840d.bin
67b96beca271d5ff8db6d4205f4bcb305d403275eb03eb731bd8bb208d3be0d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x840D 18320 bytes

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