Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e2a79a1877da21…

MALICIOUS

PDF

44.1 KB Created: 2021-06-11 01:33:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: be8ad10d6869975bf6aa76a9d3dfac06 SHA-1: 891b91ac51ecbb12f888d5f9f23f0e24eb3127ed SHA-256: 83e2a79a1877da211107a3540476cd193d503ed716b4b7975e89a376a4d3b723
82 Risk Score

Malware Insights

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

The PDF document displays a fake CAPTCHA or human verification prompt to trick the user into clicking a malicious link. This link, 'https://netcdn.tw/app/431946152/claim-free-robux-games-game-hack', likely leads to the download of a second-stage payload, such as a game hack or cheat. The document's content and embedded URLs strongly suggest a social engineering lure for malware distribution.

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/claim-free-robux-games-game-hack PDF link annotation
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/how-to-get-jump-hacks-in-roblox-booga-booga_GM431946152.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/how-to-get-free-robux-no-hack-or-survey-jessieplays_GM431946152.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/coin-master-hack-pc-2021_GM406889139.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/mcpe-free-download_GM479516143.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/coin-master-server-hack_GM406889139.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/tiktok-free-mode_GM835599320.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/pubg-uc-vietnam_GM1330123889.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/free-minecraft-java-server_GM479516143.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/omggh-new-roblox-hack-lumber-tycoon-gui_GM431946152.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/robux-gainer_GM431946152.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/cheating-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/robux-rewards_GM431946152.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/roblox-marketplace-sell-free-shirts_GM431946152.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/pokemon-go-font-free-download_GM1094591345.pdfIn PDF document text
    • https://metropolemoveis.com.br/ckfinder/userfiles/files/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050e7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50E7 24500 bytes
SHA-256: e977e353af64ce8e503f1c63df60cffdb0b325632f1dad1842791da323fbcc76
font_01_sfnt_off0000888c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x888C 18696 bytes
SHA-256: 82e76e69d520bf03d23e83480321ac6393d839ad03892eb837a0ac1e4e580bae

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