Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca9a260d3bdd33c…

MALICIOUS

PDF

47.8 KB Created: 2021-06-04 00:11:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 67155ef793dd626bdfe94e4ccc46b923 SHA-1: 1708931743ef95aa893e1ce6f3fbf9513775152d SHA-256: aca9a260d3bdd33c4302d27e7c54bb248d5c629896a929135ca86eabd5672ee9
102 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and a high-confidence ML classifier flagged it as malicious. The presence of a fake CAPTCHA heuristic indicates a social engineering attempt to trick the user into downloading further content. The document body, though heavily obfuscated, contains references to 'apps-for-free-robux' and URLs related to game hacks, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 5

  • 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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/apps-for-free-robux-game-hack
    • http://183.91.70.11/repository/minecraft-hacked-client_GM479516143.pdf
    • http://183.91.70.11/repository/roblox-apk-hack_GM431946152.pdf
    • http://183.91.70.11/repository/www-coin-master-hack-tk_GM406889139.pdf
    • http://183.91.70.11/repository/how-to-get-free-robux-easy-no-download_GM431946152.pdf
    • http://183.91.70.11/repository/coin-master-free-spins-for-today_GM406889139.pdf
    • http://183.91.70.11/repository/coin-master-free-spins-hack-apk-download_GM406889139.pdf
    • http://183.91.70.11/repository/free-private-server-roblox_GM431946152.pdf
    • http://183.91.70.11/repository/how-to-get-free-robux-gift-cards_GM431946152.pdf
    • http://183.91.70.11/repository/youtube-how-to-get-free-robux_GM431946152.pdf
    • http://183.91.70.11/repository/sites-for-free-spins-for-coin-master_GM406889139.pdf
    • http://183.91.70.11/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://183.91.70.11/repository/free-800-robux_GM431946152.pdf
    • http://183.91.70.11/repository/roblox-arsenal-hack-script-pastebin_GM431946152.pdf
    • http://183.91.70.11/repository/robux-claimer_GM431946152.pdf
    • http://183.91.70.11/repository/50-free-spins-coin-master-links_GM406889139.pdf
    • http://183.91.70.11/repository/coin-master-free-spin-best-link_GM406889139.pdf
    • http://183.91.70.11/repository/how-to-hack-people-in-roblox_GM431946152.pdf
    • http://183.91.70.11/repository/easiest-coin-master-hack_GM406889139.pdf
    • http://183.91.70.11/repository/coin-master-hack-spins-android_GM406889139.pdf
    • http://183.91.70.11/repository/pokemon-go-no-free-box_GM1094591345.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052b1.bin
63b7d15466700a3d2c2f059e003e3d1da5c2407e3477b8535e1739ee0d7e8d35
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52B1 25740 bytes
font_01_sfnt_off00008ebc.bin
a4e15770ab3b920ccbab17816ac2be280610f3f789d7654b00721cdcc5d65b79
pdf-font-stream PDF embedded font (sfnt) at offset 0x8EBC 2828 bytes
font_02_sfnt_off00009871.bin
b6bed13222f637b3eaa93fd3412fcfb5f097d091c9d6b8306e759aa57a7fe68b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9871 18192 bytes