Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb98547845edf0cb…

MALICIOUS

PDF

46.3 KB Created: 2021-06-09 10:18:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 324f48a14f1a8cf9696386b1070e75d8 SHA-1: a981a3386f1493cb8c4d2795540c160fc1121d70 SHA-256: bb98547845edf0cba8d3434f8417eb1c95a826b8ee68fd86466ca6c47923a61a
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to trick the user into interacting with a malicious link. The primary external URI points to a URL associated with 'free robux' lures, suggesting a scam or credential harvesting attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/free-robux-pointsprizes-game-hack
    • https://elearning.min2kediri.sch.id/__statics/gudangsoal/files/free-transparent-roblox-shirt_GM431946152.pdf
    • https://elearning.min2kediri.sch.id/__statics/gudangsoal/files/cheat-code-for-roblox-theme-park_GM431946152.pdf
    • https://elearning.min2kediri.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdf
    • https://elearning.min2kediri.sch.id/__statics/gudangsoal/files/roblox-free-hats_GM431946152.pdf
    • https://elearning.min2kediri.sch.id/__statics/gudangsoal/files/tiktok-likes-free_GM835599320.pdf
    • https://elearning.min2kediri.sch.id/__statics/gudangsoal/files/free-robux-no-verification-2021_GM431946152.pdf
    • https://elearning.min2kediri.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-for-kids_GM431946152.pdf
    • https://elearning.min2kediri.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-for-robux_GM431946152.pdf
    • https://elearning.min2kediri.sch.id/__statics/gudangsoal/files/how-do-you-get-free-admin-commands-on-roblox_GM431946152.pdf
    • https://elearning.min2kediri.sch.id/__statics/gudangsoal/files/comment-hacker-robloxe_GM431946152.pdf
    • https://elearning.min2kediri.sch.id/__statics/gudangsoal/files/free-spins-from-coin-master_GM406889139.pdf
    • https://elearning.min2kediri.sch.id/__statics/gudangsoal/files/free-robux-pastebin_GM431946152.pdf
    • https://elearning.min2kediri.sch.id/__statics/gudangsoal/files/can-you-get-robux-for-free_GM431946152.pdf
    • https://elearning.min2kediri.sch.id/__statics/gudangsoal/files/roblox-shirt-maker-free_GM431946152.pdf
    • https://elearning.min2kediri.sch.id/__statics/gudangsoal/files/bloxpink-free-robux_GM431946152.pdf
    • https://elearning.min2kediri.sch.id/__statics/gudangsoal/files/download-roblox-generator-hackrar_GM431946152.pdf
    • https://elearning.min2kediri.sch.id/__statics/gudangsoal/files/i-got-hacked-on-roblox_GM431946152.pdf
    • https://elearning.min2kediri.sch.id/__statics/gudangsoal/files/roblox-robux-hack_GM431946152.pdf
    • https://elearning.min2kediri.sch.id/__statics/gudangsoal/files/free-robux-gift-card-codes-2021_GM431946152.pdf
    • https://elearning.min2kediri.sch.id/__statics/gudangsoal/files/roblox-robux-promocodes-no-hack-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054a9.bin
46771b1bd7502d9bee3e73e969a160609464413e0e2d7fa9206a0e138764a00d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54A9 26416 bytes
font_01_sfnt_off00009159.bin
ab7b5ff0710e18de7d6307d10ff69877143e87db307626982ffc8ba2a76cb116		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9159 18652 bytes

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