Malicious PDF — malware analysis report

Static analysis result for SHA-256 537fc7e32eba8ec7…

MALICIOUS

PDF

47.2 KB Created: 2021-05-30 20:04:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 16c5eb84255db7ee2ccb1a5915b7f233 SHA-1: c76765490a9687ae2b063ca9c9320bb07ae2a9e2 SHA-256: 537fc7e32eba8ec70d6c7d24e934b3354cb2ec1118479534e0b1c13ebf92b8e8
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with a malicious link. The document body and embedded URLs point towards a 'free Robux' or 'game hack' theme, a common lure for phishing and malware distribution. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9418

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/free-robux-easy-game-hack
    • https://tjiko.de/wp-content/uploads/fsqm-files/free-robux-link_GM431946152.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/free-robux-giveaway_GM431946152.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/how-do-i-get-minecraft-for-free_GM479516143.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/free-robux-without-human-verification_GM431946152.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/coin-master-free-coins-and-spins-app_GM406889139.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/how-to-get-free-robux_GM431946152.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/robux-free-com_GM431946152.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/best-minecraft-hacks_GM479516143.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/minecraft-free-version_GM479516143.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/free-robux-websites-that-actually-work_GM431946152.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/get-free-robux-now_GM431946152.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/free-modded-minecraft-server-hosting_GM479516143.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/coin-master-free-spin-today_GM406889139.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/best-minecraft-hacked-client_GM479516143.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/free-robux-gift-card-codes_GM431946152.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/free-games-like-minecraft_GM479516143.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/coin-master-free-spins-link-blogspot-2021_GM406889139.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/free-robux-site_GM431946152.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/roblox-hack-me_GM431946152.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/minecraft-dungeons-free-download_GM479516143.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/minecraft-apk-free-download-016-0_GM479516143.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/free-coin-master-coins_GM406889139.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/daily-free-spins-for-coin-master_GM406889139.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/minecraft-xray-hack_GM479516143.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/free-spins-coin-master-2021_GM406889139.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/free-tiktok-followers-no-downloads_GM835599320.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/free-spins-on-coin-master-2021_GM406889139.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/is-minecraft-free-on-ps4_GM479516143.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/how-to-get-free-robux-easy-no-download_GM431946152.pdf
    • https://tjiko.de/wp-content/uploads/fsqm-files/how-to-get-free-robux-codes_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000050be.bin
ac7868ea7fcc64f965ac8dbdc79f2e3b2375cfeddc63ba6af9c8974d7754ebe8
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50BE 29812 bytes
font_01_sfnt_off00009533.bin
93fb4fe90c413bceeeea5373daaca89ae05c83417e443247d622c1bd09cfd34e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9533 18420 bytes