Malicious PDF — malware analysis report

Static analysis result for SHA-256 20737739f688272e…

MALICIOUS

PDF

42.8 KB Created: 2021-05-18 23:49:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: de5d5dd4cf55272a5b577fe2d0f12408 SHA-1: 0b9ef418520e5582a9915ae34e013dca9421d305 SHA-256: 20737739f688272e7ed631cb6d504fc8a31a001c38da2469d9651236590addbe
82 Risk Score

Malware Insights

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

The document presents itself as a "Real Free Robux Generator" and displays a fake CAPTCHA to trick the user into interacting with it. This is a common social engineering tactic to encourage users to click malicious links or download further payloads. The embedded URLs point to domains that are likely hosting malicious content or further lures.

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/real-free-robux-generator-game-hack PDF link annotation
    • http://uo-nn.ru/images/minecraft-bedrock-download-pc-free_GM479516143.pdfIn PDF document text
    • http://uo-nn.ru/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://uo-nn.ru/images/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://uo-nn.ru/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://uo-nn.ru/images/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://uo-nn.ru/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://uo-nn.ru/images/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://uo-nn.ru/images/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://uo-nn.ru/images/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://uo-nn.ru/images/coin-master-unlimited-coins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://uo-nn.ru/images/easy-robux-today_GM431946152.pdfIn PDF document text
    • http://uo-nn.ru/images/free-robux-today_GM431946152.pdfIn PDF document text
    • http://uo-nn.ru/images/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://uo-nn.ru/images/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://uo-nn.ru/images/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • http://uo-nn.ru/images/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://uo-nn.ru/images/how-to-get-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://uo-nn.ru/images/robux-app_GM431946152.pdfIn PDF document text
    • http://uo-nn.ru/images/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://uo-nn.ru/images/coin-master-free-spins-link-quora_GM406889139.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_003_off00004714.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4714 26208 bytes
SHA-256: 43fbb652854a95730aa0b8c71083c04b854c20b62eecd2118b437431d2e6a963
font_01_sfnt_off00008457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8457 18420 bytes
SHA-256: 14d46e1fdea56b33fc0f11521403768098913a132f51569f9b7a46a3ad47c201