Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d4a3ffaee8e768…

MALICIOUS

PDF

45.1 KB Created: 2021-06-03 13:24:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6a5639c35483bb0959d6cb8813109163 SHA-1: ffd6aa2f4c9475a42d9ab8272b05f33286d0ff7e SHA-256: 25d4a3ffaee8e768ebbf5a20d75defeaa56d2d126b1ae5f0afd4adc9e497db91
122 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure and links to external websites, suggesting an attempt to trick the user into downloading a payload or visiting a malicious site. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent. While no scripts were directly extracted, the document structure and heuristics point towards a common phishing or scamming technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • 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
  • 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/free-robux-sites-that-work-game-hack PDF link annotation
    • http://lib3tell.stptrisakti.net//repository/coin-master-free-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/working-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/earn-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/minecraft-pe-apk_GM479516143.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/robuxhub-net_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/robux-without-verification_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/is-roblox-studio-free_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/how-tf-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/stock-speed-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/cm-free-spins_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-free-spins-link-deutsch-ios_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005189.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5189 25100 bytes
SHA-256: a7bcc423d83fdda757e1d9739efcd13488ded1c4ad57f20eb326dadb11feb38f
font_01_sfnt_off00008baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BAF 19000 bytes
SHA-256: c0bc6bb0706fab35ff455fc4816471a1ab7f6ae4486f691ef98043b3efa3f18d

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