Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24b03ff3d069c08…

MALICIOUS

PDF

35.0 KB Created: 2021-06-27 16:22:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5550aebbe4fc0951cb9f5423dc7b90e1 SHA-1: 803496f5694a35bc88d0cde57ba1b6161c82563a SHA-256: a24b03ff3d069c083cc0496c38ae70ea7f8cb495e5165e059c34d878a7b48368
80 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple embedded URLs disguised as a lure for free Robux, a popular online game currency. The PDF_CAPTCHA_LINK_LURE heuristic indicates the presence of invisible links pointing to a CAPTCHA-themed web lure, likely designed to trick users into downloading further malware or engaging in a scam. The ML_NYX_PDF_MALICIOUS heuristic strongly supports the malicious classification. No scripts were extracted from this sample, but the document body and heuristics point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 3

  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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
  • 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 http://netcdn.co/app/431946152/how-to-get-free-robux-no-captcha-game-hack
    • https://prom2m.ru/wp-content/uploads/fsqm-files/how-to-hack-roblox-dinosaur-simulator_GM431946152.pdf
    • https://prom2m.ru/wp-content/uploads/fsqm-files/hotshotgamers-roblox-cheat_GM431946152.pdf
    • https://prom2m.ru/wp-content/uploads/fsqm-files/cheat-codes-no-promises-roblox-id_GM431946152.pdf
    • https://prom2m.ru/wp-content/uploads/fsqm-files/free-penguin-in-roblox_GM431946152.pdf
    • https://prom2m.ru/wp-content/uploads/fsqm-files/free-cool-pants-roblox_GM431946152.pdf
    • https://prom2m.ru/wp-content/uploads/fsqm-files/free-robux-promo-codes-september-2021_GM431946152.pdf
    • https://prom2m.ru/wp-content/uploads/fsqm-files/roblox-zombie-attack-hack-script_GM431946152.pdf
    • https://prom2m.ru/wp-content/uploads/fsqm-files/free-robux-codes-2021_GM431946152.pdf
    • https://prom2m.ru/wp-content/uploads/fsqm-files/robux-gratis-hack-sin-verificacion-humana_GM431946152.pdf
    • https://prom2m.ru/wp-content/uploads/fsqm-files/hack-day-z-2-roblox-2021_GM431946152.pdf
    • https://prom2m.ru/wp-content/uploads/fsqm-files/minecraft-dungeons-free_GM479516143.pdf
    • https://prom2m.ru/wp-content/uploads/fsqm-files/free-robux-robux-boost_GM431946152.pdf
    • https://prom2m.ru/wp-content/uploads/fsqm-files/roblox-games-free-download-for-android_GM431946152.pdf
    • https://prom2m.ru/wp-content/uploads/fsqm-files/how-to-get-free-robux-on-roblox-october-2021_GM431946152.pdf
    • https://prom2m.ru/wp-content/uploads/fsqm-files/get-free-robux-pc-and-mobile_GM431946152.pdf
    • https://prom2m.ru/wp-content/uploads/fsqm-files/cheat-engine-64-roblox-robux-hack_GM431946152.pdf
    • https://prom2m.ru/wp-content/uploads/fsqm-files/videos-de-hacks-para-roblox_GM431946152.pdf
    • https://prom2m.ru/wp-content/uploads/fsqm-files/aex-hack-roblox_GM431946152.pdf
    • https://prom2m.ru/wp-content/uploads/fsqm-files/20210-free-robux_GM431946152.pdf
    • https://prom2m.ru/wp-content/uploads/fsqm-files/how-to-hack-in-roblox-using-cheat-engine_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030a6.bin
becc30da0cf9957db709fc0d2e5d03b581ed8859533b84ed6f79e5c3bd09f5e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x30A6 22432 bytes
font_01_sfnt_off000062e1.bin
122d31a91afaf4a728c5aa54a4067c8f77a89675ad842eec3a3429ac52bc8f3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x62E1 19328 bytes