Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f3c376e98071d6…

MALICIOUS

PDF

35.5 KB Created: 2021-07-05 16:57:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 63a29ec0ab29d5dca80ecf46c092d763 SHA-1: a6771c55036370ddcd3327030f497a0e0f3263ed SHA-256: b8f3c376e98071d6bc0192f5ff023590c45a521ddab396f0a873076671258a05
122 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a clipboard-command (paste-and-run) lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 http://netcdn.tw/app/431946152/robux-generator-no-verification-2021-game-hack PDF link annotation
    • http://perpus.stfm.ac.id/repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-coins-coin-master-today_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/can-we-hack-roblox-with-fe_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/roblox-generator_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/how-to-hack-a-minecraft-account_GM479516143.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/optifine-pe_GM479516143.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/minecraft-hacks-for-2b2t_GM479516143.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/haktuts-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-minecraft-skin-maker_GM479516143.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/bux-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/best-free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/spins-gratis-coin-master-hoy_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3216 22664 bytes
SHA-256: 0a5830b30d62dc10e537ee6ce3d95e6b1d5d76f17a82259be551c1bc1315d344
font_01_sfnt_off000064ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64BA 19312 bytes
SHA-256: e87996554a28625538ac949b95fe0d935b31d0f90cb91e6b9a3bc1e079d88d16

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