Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd25c5fea2acba3…

MALICIOUS

PDF

46.7 KB Created: 2021-06-03 23:29:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 25b01a4934d8df55e9ab384f9a0fa9d6 SHA-1: 55fdec1ddea5d3b29ebaef4357d76e9f7d625665 SHA-256: 1bd25c5fea2acba34c9ecdbf022f5417941571f37301a12b27a7e111a70cbf91
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA heuristic, indicating a social engineering attempt to trick the user into interacting with the document. It also embeds external URIs, with a primary URL pointing to a 'coin master daily free spins' hack, suggesting a lure for game-related cheats or exploits. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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/406889139/coin-master-daily-free-spins-and-coins-game-hack
    • http://library.acehresearch.org/repository/pokemon-go-free-high-level-account-hack_GM1094591345.pdf
    • http://library.acehresearch.org/repository/tiktok-free-7-day_GM835599320.pdf
    • http://library.acehresearch.org/repository/free-spins-on-coin-master-cheat_GM406889139.pdf
    • http://library.acehresearch.org/repository/tiktok-for-free-install_GM835599320.pdf
    • http://library.acehresearch.org/repository/blox-supply-free-robux_GM431946152.pdf
    • http://library.acehresearch.org/repository/how-to-get-a-refund-on-roblox-2021_GM431946152.pdf
    • http://library.acehresearch.org/repository/is-minecraft-education-edition-free_GM479516143.pdf
    • http://library.acehresearch.org/repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdf
    • http://library.acehresearch.org/repository/minecraft-kill-aura_GM479516143.pdf
    • http://library.acehresearch.org/repository/robux-no-human-verification-2021_GM431946152.pdf
    • http://library.acehresearch.org/repository/free-downloads-for-coin-master-daily-rewards_GM406889139.pdf
    • http://library.acehresearch.org/repository/coin-master-hack-xyz-download_GM406889139.pdf
    • http://library.acehresearch.org/repository/free-money-links-coin-master_GM406889139.pdf
    • http://library.acehresearch.org/repository/is-minecraft-java-free_GM479516143.pdf
    • http://library.acehresearch.org/repository/is-minecraft-free_GM479516143.pdf
    • http://library.acehresearch.org/repository/coin-master-hack-app-2021_GM406889139.pdf
    • http://library.acehresearch.org/repository/coin-master-free-spins-for-today_GM406889139.pdf
    • http://library.acehresearch.org/repository/pokemon-go-free-and-switch-connect_GM1094591345.pdf
    • http://library.acehresearch.org/repository/do-robux-generators-work_GM431946152.pdf
    • http://library.acehresearch.org/repository/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000513b.bin
5ea95c87e7f41fcba2d81694afec588969bb0769596870cca177b737397aea6c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x513B 24944 bytes
font_01_sfnt_off00008948.bin
e5f6ec650849eefe6bc6a1649c2875ce35328d23e4196945bba66cc43e5a49d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8948 2820 bytes
font_02_sfnt_off000092e7.bin
323fea871d3154f9ddf991b22fd859b77165b4ee4e2d03de0fe4666202988bbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92E7 18480 bytes

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