Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da781e33ff448f2…

MALICIOUS

PDF

49.2 KB Created: 2021-06-04 01:15:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: de053bbb2aa40d977a829d6a2bf6f723 SHA-1: 870571f27e642e321d3f93365a04738b36b43d4e SHA-256: 5da781e33ff448f26760ff78181838da9a4f7463b9d1e0e2e175390642c8d45b
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 clicking a malicious link. The primary link identified, 'https://netcdn.online/app/431946152/free-robux-no-verify-game-hack', is likely intended to lead to a further stage of infection or credential harvesting. The ML classifier also flagged this PDF as malicious with high confidence.

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.online/app/431946152/free-robux-no-verify-game-hack
    • http://library.yamasi.ac.id//repository/free-spins-coin-master-app_GM406889139.pdf
    • http://library.yamasi.ac.id/repository/try-coin-master-hack_GM406889139.pdf
    • http://library.yamasi.ac.id//repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdf
    • http://library.yamasi.ac.id/repository/free-spin-and-coin-blogspot_GM406889139.pdf
    • http://library.yamasi.ac.id//repository/free-spins-for-coin-master-app_GM406889139.pdf
    • http://library.yamasi.ac.id//repository/free-minecraft-worlds_GM479516143.pdf
    • http://library.yamasi.ac.id/repository/coin-master-apk_GM406889139.pdf
    • http://library.yamasi.ac.id/repository/play-coin-master-for-free_GM406889139.pdf
    • http://library.yamasi.ac.id//repository/hack-coins-in-coin-master_GM406889139.pdf
    • http://library.yamasi.ac.id//repository/free-appsfor-coin-master-daily-rewards_GM406889139.pdf
    • http://library.yamasi.ac.id//repository/get-free-spins-on-coin-master_GM406889139.pdf
    • http://library.yamasi.ac.id/repository/free-robux-codes-no-human-verification_GM431946152.pdf
    • http://library.yamasi.ac.id/repository/free-minecraft-windows-10-account_GM479516143.pdf
    • http://library.yamasi.ac.id/repository/coin-master-hack-online-2021_GM406889139.pdf
    • http://library.yamasi.ac.id/repository/roblox-com-robux_GM431946152.pdf
    • http://library.yamasi.ac.id/repository/free-spins-on-coin-master-2021_GM406889139.pdf
    • http://library.yamasi.ac.id/repository/rbx-roblox_GM431946152.pdf
    • http://library.yamasi.ac.id/repository/robux-games_GM431946152.pdf
    • http://library.yamasi.ac.id/repository/coin-master-hack-ios-cydia_GM406889139.pdf
    • http://library.yamasi.ac.id/repository/how-to-get-free-roebucks-in-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005114.bin
8276d801e09a1c436516c291e45449061448f9c40cd6c4f9e35da6ee65545c3b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5114 27136 bytes
font_01_sfnt_off00008ff0.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF0 5696 bytes
font_02_sfnt_off00009d02.bin
c82a2e535d1b02ce633786be567827726fc21df48f71ae9cb05a1d9866072f5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D02 18448 bytes

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