Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a287ef699e53ccd…

MALICIOUS

PDF

43.4 KB Created: 2021-05-16 18:07:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3e74f5f7b0989136ffedd2091bcb2a6f SHA-1: 5373cf8245b14c5d80550b4d9bdf97ad2d15772a SHA-256: 4a287ef699e53ccdb2fa7c258f1fee431bf518b9654efd1b7e92c9f44fb8b9f6
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, a common social engineering tactic to trick users into interacting with malicious content. It also embeds an external URI pointing to a URL that promises free Robux, further reinforcing the lure. The presence of numerous related URLs suggests a campaign distributing similar lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/get-free-robux-no-verification-game-hack
    • http://ambingenieria.com/images/how-to-hack-a-roblox-account-2021_GM431946152.pdf
    • http://ambingenieria.com/images/how-to-get-free-stuff-on-roblox_GM431946152.pdf
    • http://ambingenieria.com/images/what-is-wurst_GM479516143.pdf
    • http://ambingenieria.com/images/minecraft-pe-hacks-ios_GM479516143.pdf
    • http://ambingenieria.com/images/coin-master-free-spins-daily_GM406889139.pdf
    • http://ambingenieria.com/images/coin-master-spin-hack-pc_GM406889139.pdf
    • http://ambingenieria.com/images/robux-redeem_GM431946152.pdf
    • http://ambingenieria.com/images/coin-master-daily-spin-free_GM406889139.pdf
    • http://ambingenieria.com/images/robux-free-co_GM431946152.pdf
    • http://ambingenieria.com/images/100-free-spins-for-coin-master-2021_GM406889139.pdf
    • http://ambingenieria.com/images/coin-master-free-spins-1701-20_GM406889139.pdf
    • http://ambingenieria.com/images/roblox-t-shirt-free_GM431946152.pdf
    • http://ambingenieria.com/images/free-minecraft-gift-card_GM479516143.pdf
    • http://ambingenieria.com/images/minecraft-pe-free-download-android_GM479516143.pdf
    • http://ambingenieria.com/images/how-to-hack-roblox-for-robux_GM431946152.pdf
    • http://ambingenieria.com/images/roblox-hacks-and-cheats_GM431946152.pdf
    • http://ambingenieria.com/images/claim-free-spins-coin-master_GM406889139.pdf
    • http://ambingenieria.com/images/hack-to-protect-village-on-coin-master_GM406889139.pdf
    • http://ambingenieria.com/images/free-spins-for-coin-master-2021_GM406889139.pdf
    • http://ambingenieria.com/images/bloxland-earn-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004933.bin
0e7ffb551ca2dc32217b401c10b8b962860f030699f9ad976ec978e5d4a21326		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4933 26500 bytes
font_01_sfnt_off0000863f.bin
9922d9be899d889309b30d551f0ca0ad5440aa2f545e895e218caf9f3be39a86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x863F 18600 bytes

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