Malicious PDF — malware analysis report

Static analysis result for SHA-256 6557723e9322f819…

MALICIOUS

PDF

45.4 KB Created: 2021-05-13 23:34:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: aaf4b8859cd6885b522ad6d602468f29 SHA-1: 1c24cff8cc5aad672b90af3cd1086d62baf5e7fc SHA-256: 6557723e9322f819d51b3639e9114a119348a2f857e8da695c1d6f263c6b5404
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document displays a fake CAPTCHA to trick users into clicking a link, likely to download a second-stage payload or redirect to a phishing site. The embedded URL and numerous other URLs found in the document body point to sites offering 'free Robux' or similar game-related lures. No scripts were extracted, but the presence of external URIs and the fake CAPTCHA heuristic strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/uprobux.com-free-robux-game-hack
    • https://bioscience.kyst.com.tw/image/data/files/earn-robux-websites_GM431946152.pdf
    • https://bioscience.kyst.com.tw/image/data/files/free-spins-coin-master-2021_GM406889139.pdf
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-free-spins-for-iphone_GM406889139.pdf
    • https://bioscience.kyst.com.tw/image/data/files/roblox-army-free-robux_GM431946152.pdf
    • https://bioscience.kyst.com.tw/image/data/files/get-me-robux_GM431946152.pdf
    • https://bioscience.kyst.com.tw/image/data/files/free-robux-no-apps_GM431946152.pdf
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-fan-page-giveaway_GM406889139.pdf
    • https://bioscience.kyst.com.tw/image/data/files/free-dominus-roblox_GM431946152.pdf
    • https://bioscience.kyst.com.tw/image/data/files/hacking-apps-for-roblox_GM431946152.pdf
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-free-spins-hack-without-human-verification_GM406889139.pdf
    • https://bioscience.kyst.com.tw/image/data/files/scaffold-minecraft-hack_GM479516143.pdf
    • https://bioscience.kyst.com.tw/image/data/files/free-robux-working_GM431946152.pdf
    • https://bioscience.kyst.com.tw/image/data/files/rbx-hut-promo-codes_GM431946152.pdf
    • https://bioscience.kyst.com.tw/image/data/files/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdf
    • https://bioscience.kyst.com.tw/image/data/files/roblox-free-hair-codes_GM431946152.pdf
    • https://bioscience.kyst.com.tw/image/data/files/how-to-hack-roblox-for-robux_GM431946152.pdf
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-free-spin-and-coins-links_GM406889139.pdf
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-game-hack-app_GM406889139.pdf
    • https://bioscience.kyst.com.tw/image/data/files/roblox-hacks-com_GM431946152.pdf
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-free-spins-promo-code_GM406889139.pdf
    • https://direct-link.net
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004582.bin
39fbd1c444af2625e068c5f4bd572ca94ccc262d2dc0769e0f02853da52ea2ef		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4582 27264 bytes
font_01_sfnt_off000083d5.bin
e9630f3bb738ae3bc329a423cf069c8035d70ce2227e3557c42815f85ad3284f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83D5 2852 bytes
font_02_sfnt_off00008d97.bin
143ab518bfe1873128e001b27a68cdab9711d8d723564be581f3f50f35f3a2b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D97 18700 bytes

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