Malicious PDF — malware analysis report

Static analysis result for SHA-256 0413621987c98353…

MALICIOUS

PDF

47.3 KB Created: 2021-06-04 04:08:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: cf72a5c4ab950444688f421336b4a2ff SHA-1: 55783c2d225ec313e214acb3a96bd0b1f0b4abf6 SHA-256: 0413621987c98353f6496c88e423bec403c491f34462ed3799be53dd108ae6b4
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document presents a fake CAPTCHA or download prompt to trick the user into interacting with it. It contains an external URI pointing to a suspicious URL, likely intended to download a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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-roblox-acc-game-hack
    • http://lib.kunci.or.id/repository/minecraft-free-online_GM479516143.pdf
    • http://lib.kunci.or.id/repository/gamesofficenet-hack-coin-master_GM406889139.pdf
    • http://lib.kunci.or.id/repository/coin-master-cheat-engine-hack_GM406889139.pdf
    • http://lib.kunci.or.id/repository/how-to-get-free-pet-food-on-coin-master_GM406889139.pdf
    • http://lib.kunci.or.id/repository/best-free-spin-app-for-coin-master_GM406889139.pdf
    • http://lib.kunci.or.id/repository/guide--coin-master-free-tips_GM406889139.pdf
    • http://lib.kunci.or.id/repository/coin-master-fan_GM406889139.pdf
    • http://lib.kunci.or.id/repository/roblox-games-that-give-you-free-robux_GM431946152.pdf
    • http://lib.kunci.or.id/repository/coin-master-invite-friends-free-spins_GM406889139.pdf
    • http://lib.kunci.or.id/repository/rbx-hut-promo-codes_GM431946152.pdf
    • http://lib.kunci.or.id/repository/free-robux-2021_GM431946152.pdf
    • http://lib.kunci.or.id/repository/roblox-group-free-robux_GM431946152.pdf
    • http://lib.kunci.or.id/repository/hack-minecraft_GM479516143.pdf
    • http://lib.kunci.or.id/repository/coin-master-free-food-for-pet_GM406889139.pdf
    • http://lib.kunci.or.id/repository/coin-coin-master-hack_GM406889139.pdf
    • http://lib.kunci.or.id/repository/unlimited-coin-master-free-spins_GM406889139.pdf
    • http://lib.kunci.or.id/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdf
    • http://lib.kunci.or.id/repository/free-coin-master-gifts_GM406889139.pdf
    • http://lib.kunci.or.id/repository/free-robux-without-human-verification-real_GM431946152.pdf
    • http://lib.kunci.or.id/repository/coin-master-free-attack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004c80.bin
0a2a5f6d413490076f8aab46f2f040a88ba15bf1e10689e4dd32480b69c3cadf		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C80 28872 bytes
font_01_sfnt_off00008d8e.bin
30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D8E 2840 bytes
font_02_sfnt_off00009741.bin
74db3e5e7aeb6f0756448051187db7defe34e7c9b7f0bab0dc8e4ffe2ac72fee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9741 17948 bytes

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