Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb15846a792cfde…

MALICIOUS

PDF

44.9 KB Created: 2021-06-11 10:58:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 097ad65e63bdeaccc2f653c71f15156f SHA-1: 75d53167d59c283ec98990e67f7beb289f811934 SHA-256: dbb15846a792cfdeb27c1d3ce3f1e4278d4f51780b1e56675d6bd52a727fd8d5
162 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are related to game cheats and free virtual currency, suggesting a lure for users seeking such items. The presence of a fake CAPTCHA heuristic indicates an attempt to trick users into performing an action, likely clicking a malicious link. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • 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.tw/app/431946152/dife-cf-free-robux-game-hack
    • http://elearning.man1konselkonda.sch.id/__statics/gudangsoal/files/roblox-cheats-how-to-get-free-gear_GM431946152.pdf
    • http://elearning.man1konselkonda.sch.id/__statics/gudangsoal/files/how-to-get-free-comends-on-roblox_GM431946152.pdf
    • http://elearning.man1konselkonda.sch.id/__statics/gudangsoal/files/roblox-free-robux-code-generator_GM431946152.pdf
    • http://elearning.man1konselkonda.sch.id/__statics/gudangsoal/files/free-minecraft-servers-to-join_GM479516143.pdf
    • http://elearning.man1konselkonda.sch.id/__statics/gudangsoal/files/free-robux-generator-no-verification_GM431946152.pdf
    • http://elearning.man1konselkonda.sch.id/__statics/gudangsoal/files/free-tiktok-followers-no-human-verification_GM835599320.pdf
    • http://elearning.man1konselkonda.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • http://elearning.man1konselkonda.sch.id/__statics/gudangsoal/files/free-robux-games-that-actually-work-2021_GM431946152.pdf
    • http://elearning.man1konselkonda.sch.id/__statics/gudangsoal/files/nnuevo-hack-de-robux-20210_GM431946152.pdf
    • http://elearning.man1konselkonda.sch.id/__statics/gudangsoal/files/coin-master-free-spin-and-coins-links_GM406889139.pdf
    • http://elearning.man1konselkonda.sch.id/__statics/gudangsoal/files/robloxmatchcom-free-robux_GM431946152.pdf
    • http://elearning.man1konselkonda.sch.id/__statics/gudangsoal/files/free-robux-without-human-verification_GM431946152.pdf
    • http://elearning.man1konselkonda.sch.id/__statics/gudangsoal/files/minecraft-hacks-115-2_GM479516143.pdf
    • http://elearning.man1konselkonda.sch.id/__statics/gudangsoal/files/how-to-hack-any-roblox-account-using-windows-command-prompt_GM431946152.pdf
    • http://elearning.man1konselkonda.sch.id/__statics/gudangsoal/files/roblox-name-change-free_GM431946152.pdf
    • http://elearning.man1konselkonda.sch.id/__statics/gudangsoal/files/roblox-players-passwords-to-hack-them_GM431946152.pdf
    • http://elearning.man1konselkonda.sch.id/__statics/gudangsoal/files/minecraft-free-play-no-download_GM479516143.pdf
    • http://elearning.man1konselkonda.sch.id/__statics/gudangsoal/files/hacked-client-for-minecraft-bedrock_GM479516143.pdf
    • http://elearning.man1konselkonda.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdf
    • http://elearning.man1konselkonda.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-no-survey_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005314.bin
aa5a1623100f944b26f00fcecfed41b7e454b76c7212ea098da113f9637c6f1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5314 26400 bytes
font_01_sfnt_off00008cc9.bin
0760099b24ac017b8dcd385a3bbb760e177b7d2e150ab810f0d7912fc122e0e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC9 18300 bytes

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