Malicious PDF — malware analysis report

Static analysis result for SHA-256 494e3b84f95e1038…

MALICIOUS

PDF

46.9 KB Created: 2021-05-17 03:50:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4132056616aeded7076046c08a01e8f9 SHA-1: a3e56cff19bf5c462d89e9b3ff1d0feee2a859d0 SHA-256: 494e3b84f95e103858ab417b90fefef4e5cbf5e68d9b01b37387aa58e25378bb
82 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a malicious lure, specifically by displaying a fake CAPTCHA or human verification prompt. This is intended to deceive the user into interacting with a malicious link, such as the embedded URL 'https://netcdn.xyz/app/431946152/free-robux-with-no-verification-2021-game-hack'. The document's content and heuristics suggest an attempt to trick users into downloading potentially harmful software under the guise of free Robux or game hacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/free-robux-with-no-verification-2021-game-hack
    • https://studentcareerinfo.com/images/coin-master-app-hacks_GM406889139.pdf
    • https://studentcareerinfo.com/images/free-robux-websites-2021_GM431946152.pdf
    • https://studentcareerinfo.com/images/coin-master-daily-free-spins-link-today-2021_GM406889139.pdf
    • https://studentcareerinfo.com/images/how-to-earn-robux-by-playing-games_GM431946152.pdf
    • https://studentcareerinfo.com/images/get-free-robux_GM431946152.pdf
    • https://studentcareerinfo.com/images/113-hacked-client_GM479516143.pdf
    • https://studentcareerinfo.com/images/is-it-possible-to-get-free-robux_GM431946152.pdf
    • https://studentcareerinfo.com/images/free-robux-scams_GM431946152.pdf
    • https://studentcareerinfo.com/images/i-need-more-free-spins-on-coin-master_GM406889139.pdf
    • https://studentcareerinfo.com/images/coin-master-spin-rewards_GM406889139.pdf
    • https://studentcareerinfo.com/images/coin-master-daily-free-spins-link-today-blog_GM406889139.pdf
    • https://studentcareerinfo.com/images/50-000-free-spins-coin-master_GM406889139.pdf
    • https://studentcareerinfo.com/images/hack-coin-master-android-2021_GM406889139.pdf
    • https://studentcareerinfo.com/images/coin-master-update-2021_GM406889139.pdf
    • https://studentcareerinfo.com/images/free-robux-games-that-actually-work-2021_GM431946152.pdf
    • https://studentcareerinfo.com/images/roblox-royale-high-diamond-hack_GM431946152.pdf
    • https://studentcareerinfo.com/images/free-robux-scam_GM431946152.pdf
    • https://studentcareerinfo.com/images/how-to-hack-robux_GM431946152.pdf
    • https://studentcareerinfo.com/images/free-minecraft-accounts-2021_GM479516143.pdf
    • https://studentcareerinfo.com/images/is-minecraft-free-on-mac_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004cde.bin
32d30ab581829da6edfaa72332083e5e06072780605c71036cc7b74061b83d38		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CDE 25572 bytes
font_01_sfnt_off00008790.bin
10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8790 2880 bytes
font_02_sfnt_off0000917b.bin
aac922b8691acc9aa277dffee065f580c863b50a75d1a5b8a64d6db85e21622d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x917B 19368 bytes

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