Malicious PDF — malware analysis report

Static analysis result for SHA-256 d786b71343cb82fb…

MALICIOUS

PDF

42.8 KB Created: 2021-05-14 05:06:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a6ac62269f374efe5bef655d60c38955 SHA-1: b728c8d333dae23fbd40d60164d66987a84ce33d SHA-256: d786b71343cb82fb67f2a138f0a7c9f33f8260823dfc2ab6cc5c1ac74638c69e
102 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, aiming to trick users into downloading further malicious content. It embeds multiple URLs, including one pointing to a raw IP address, which likely serve as download locations for malware. The document body and heuristics strongly suggest a social engineering tactic to distribute potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/roblox-play-now-for-free-game-hack
    • http://103.19.59.42/__statics/gudangsoal/files/roblox-exploit-download_GM431946152.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/free-avatar-roblox_GM431946152.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/free-robux-com-real_GM431946152.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/i-need-robux_GM431946152.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/roblox-free-body_GM431946152.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/buxblast-com-robux_GM431946152.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/minecraft-free-version-pc_GM479516143.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/minecraft-reach-hack_GM479516143.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/free-coin-spin-daily-link-for-coin-master-game_GM406889139.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/coin-master-hack-online-generator_GM406889139.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/minecraft-free-download-android_GM479516143.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/free-coin-coin-master_GM406889139.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/free-game-pack-with-google-play-coin-master_GM406889139.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/roblox-hack-unlimited-robux_GM431946152.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/hack-a-game_GM431946152.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/coin-master-free-spin-trick_GM406889139.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/coin-master-free-coins-and-spins-hack_GM406889139.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/download-coin-master-hack-mod-apk_GM406889139.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049de.bin
cd805d20a0cf55468459d673b33678f97a59a6b4bdd9d94835a138a9da62da0d
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49DE 25320 bytes
font_01_sfnt_off000083a9.bin
6ac13014d956568d3c4459397943de1ac554c9b5ba0cd330a45a51033578dd02
pdf-font-stream PDF embedded font (sfnt) at offset 0x83A9 18672 bytes