Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d98d5bad29e7de1…

MALICIOUS

PDF

44.9 KB Created: 2021-06-08 20:47:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: aa29bf3417d9a7d7398495cbe7b34928 SHA-1: 6303bf239737955eff0a9cdfd7bc3ce283ecb273 SHA-256: 5d98d5bad29e7de1df8290aec3c9d5f113cf4381a25bb9863a099cd2ab99f195
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure to trick users into clicking a malicious link. The embedded URL, https://netcdn.tw/app/431946152/how-to-get-free-robux-c-game-hack, is presented as a way to obtain 'free Robux'. The document's content and heuristics strongly suggest a social engineering attack aimed at driving users to potentially malicious external resources.

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-get-free-robux-c-game-hack PDF link annotation
    • http://www.fluidtech.hu/images/minecraft-esp_GM479516143.pdfIn PDF document text
    • http://www.fluidtech.hu/images/minecraft-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://www.fluidtech.hu/images/roblox-jailbreak-hack-2021-april_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/site-17-roblox-hacking_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/freespinandcoin-blogspot_GM406889139.pdfIn PDF document text
    • http://www.fluidtech.hu/images/free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://www.fluidtech.hu/images/give-me-robux_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/how-to-get-free-animations-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/minecraft-bedrock-hacks-windows-10_GM479516143.pdfIn PDF document text
    • http://www.fluidtech.hu/images/hack-coin-master-nyc_GM406889139.pdfIn PDF document text
    • http://www.fluidtech.hu/images/how-to-get-free-roblox-hair_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/hack-the-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.fluidtech.hu/images/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/earn-points-for-robux_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://www.fluidtech.hu/images/minecraft-online-free-download_GM479516143.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_off00005062.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5062 26192 bytes
SHA-256: 8951f5a425a4d33225bef0c033eb9263d435793ddd73c7c51625e423f9df0b23
font_01_sfnt_off00008ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CCD 18280 bytes
SHA-256: 2eeeedfcb2f224ab556fa0ab031baeab03f86dcbcf90e3baaaf5b6d88536dec3

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