Malicious PDF — malware analysis report

Static analysis result for SHA-256 83444ccd5447759a…

MALICIOUS

PDF

44.1 KB Created: 2021-06-11 10:30:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ed61148e081a8a7708597149bc549e15 SHA-1: a5855cbeb2157c3f1e62e1da02d73ce3fde744cb SHA-256: 83444ccd5447759aa6bb8f40bf344a978b04a5ec43d0b6ec0857e3f84c077ff0
82 Risk Score

Malware Insights

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

The document displays a fake CAPTCHA lure to deceive users into interacting with it, likely to download a secondary payload. The embedded URL, https://netcdn.tw/app/431946152/how-to-cheat-script-roblox-game-hack, is a strong indicator of malicious intent, as are the numerous other URLs pointing to similar download lures. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/how-to-cheat-script-roblox-game-hack
    • http://pwpyemen.org/images/free-robux-hack-no-human-verification_GM431946152.pdf
    • http://pwpyemen.org/images/coin-master-hack-coins_GM406889139.pdf
    • http://pwpyemen.org/images/free-robux-codes-generator-no-verification_GM431946152.pdf
    • http://pwpyemen.org/images/minecraft-bedrock-download-pc-free_GM479516143.pdf
    • http://pwpyemen.org/images/coin-master-download_GM406889139.pdf
    • http://pwpyemen.org/images/how-to-get-free-robux-hack-2021_GM431946152.pdf
    • http://pwpyemen.org/images/free-robux-gift-card_GM431946152.pdf
    • http://pwpyemen.org/images/minecraft-bedrock-edition-pc-download-free_GM479516143.pdf
    • http://pwpyemen.org/images/free-robux-easy_GM431946152.pdf
    • http://pwpyemen.org/images/free-robux-generator-website_GM431946152.pdf
    • http://pwpyemen.org/images/free-robux-cards_GM431946152.pdf
    • http://pwpyemen.org/images/roblox-pokemon-brick-bronze-how-to-get-free-pokemon_GM431946152.pdf
    • http://pwpyemen.org/images/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdf
    • http://pwpyemen.org/images/minecraft-mobile-free_GM479516143.pdf
    • http://pwpyemen.org/images/how-to-get-free-tiktok-followers-without-human-verification_GM835599320.pdf
    • http://pwpyemen.org/images/how-to-get-minecraft-coins-for-free_GM479516143.pdf
    • http://pwpyemen.org/images/how-to-hack-coin-master-in-pc_GM406889139.pdf
    • http://pwpyemen.org/images/coin-master-free-spins-for-today_GM406889139.pdf
    • http://pwpyemen.org/images/coin-master-facebook_GM406889139.pdf
    • http://pwpyemen.org/images/get-free-likes-on-tiktok_GM835599320.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004faf.bin
7ce01b0f81d4b874b8cae8ca534042a8b6b8b928f2846b495ccf998862393e2a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FAF 25160 bytes
font_01_sfnt_off0000886c.bin
e8beb438403a19cf2cac3cf3e587bdc5cee9612b5026c8929ee38f014687c17b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x886C 18744 bytes

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