Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53b6042e398ed68…

MALICIOUS

PDF

49.0 KB Created: 2021-06-09 12:20:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6f5f273913baaa5fae2282768463b50f SHA-1: c9656c6c61af68bfdc15610ec7e2cd56a1cd7233 SHA-256: f53b6042e398ed688ceb9778f65c7b2cd9ff5aa3e448f7dedcf3135564466a0d
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with malicious links. The primary URL, https://netcdn.tw/app/431946152/free-robux-now-no-human-verification-game-hack, is likely a landing page for a scam or further malware distribution. The document's content and heuristics strongly suggest a social engineering attack aimed at tricking users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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-now-no-human-verification-game-hack
    • http://fkunismuh.org/perpustakaan/repository/earn-free-robux-today_GM431946152.pdf
    • http://fkunismuh.org/perpustakaan//repository/coin-master-free-spin-link-today-16-11-2021_GM406889139.pdf
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-hack-apk-2021_GM406889139.pdf
    • http://fkunismuh.org/perpustakaan/repository/buy-robux-free_GM431946152.pdf
    • http://fkunismuh.org/perpustakaan/repository/where-can-i-get-free-spins-for-coin-master_GM406889139.pdf
    • http://www.fkunismuh.org/perpustakaan/repository/game-give-free-robux_GM431946152.pdf
    • http://fkunismuh.org/perpustakaan/repository/roblox-generator_GM431946152.pdf
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdf
    • http://www.fkunismuh.org/perpustakaan/repository/free-games-like-coin-master_GM406889139.pdf
    • http://fkunismuh.org/perpustakaan//repository/promo-codes-for-free-robux_GM431946152.pdf
    • http://www.fkunismuh.org/perpustakaan/repository/free-400-spins-coin-master_GM406889139.pdf
    • http://www.fkunismuh.org/perpustakaan/repository/roblox-hack-ios_GM431946152.pdf
    • http://fkunismuh.org/perpustakaan/repository/best-roblox-hacks_GM431946152.pdf
    • http://fkunismuh.org/perpustakaan/repository/prison-life-gives-free-robux_GM431946152.pdf
    • http://fkunismuh.org/perpustakaan/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdf
    • http://fkunismuh.org/perpustakaan//repository/free-coins-and-spins_GM406889139.pdf
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdf
    • http://fkunismuh.org/perpustakaan/repository/ways-to-get-free-robux_GM431946152.pdf
    • http://fkunismuh.org/perpustakaan//repository/roblox-free-robux-website_GM431946152.pdf
    • http://fkunismuh.org/perpustakaan//repository/is-there-a-way-to-get-free-robux_GM431946152.pdf
    • https://Buy.HoaxMC.com
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004d45.bin
8d1a37db7cc7764584258b3c27cf091b0b6884eb72c6dad9cc563150e1f29e2a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D45 29040 bytes
font_01_sfnt_off00008dd0.bin
9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD0 5596 bytes
font_02_sfnt_off00009a78.bin
4c237f1a13563c13617724fdd1c51842abcb8316c8d04ee917138185ec1a87ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A78 19024 bytes

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