Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1fca6859818a4f4…

MALICIOUS

PDF

44.0 KB Created: 2021-05-12 00:31:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f06fdb8fd6f3f7566909cd6d5314807c SHA-1: 0075b9b8c2f525217d9653fb85a443b968533616 SHA-256: a1fca6859818a4f48107332252a2c64e7d88037d8f5cef7c2e003353ab3bc562
122 Risk Score

Malware Insights

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

The PDF document displays a fake CAPTCHA and a call-to-action lure, attempting to trick the user into clicking a link. The embedded URLs, including one pointing to an IP address, suggest the document is designed to redirect users to malicious sites, likely for scams or to download further payloads. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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-now-game-hack
    • http://103.19.59.42/__statics/gudangsoal/files/free-robux-2021_GM431946152.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/coin-master-on-facebook_GM406889139.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/how-to-hack-roblox-games_GM431946152.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/coin-master-update-2021_GM406889139.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/free-robux-youtube_GM431946152.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/coin-master-free-spins-link-hack_GM406889139.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/how-to-win-free-robux_GM431946152.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/coin-master-apk-hack-35-8_GM406889139.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/download-coin-master-apk-hacked_GM406889139.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/free-robux-discord-servers_GM431946152.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/coin-master-free-spins-app-for-iphone_GM406889139.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/free-robux-kid-friendly_GM431946152.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/free-robux-images_GM431946152.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/coin-master-daily-free-spin-app_GM406889139.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/free-spin-link_GM406889139.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/free-coin-master-spin-and-coin-link_GM406889139.pdf
    • http://103.19.59.42/__statics/gudangsoal/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a29.bin
0758a359be9dc2240c2dce16e9425c63ed6dd7edcc56404a07ad88dcb72901d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A29 27504 bytes
font_01_sfnt_off000089a5.bin
538c9dd0db01d2f7ccbac1c4b1e59781ee6b2d24c7879b3cb67aab50807a8027		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89A5 18280 bytes

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