Malicious PDF — malware analysis report

Static analysis result for SHA-256 4026a1cfcdda588d…

MALICIOUS

PDF

49.6 KB Created: 2021-06-03 09:02:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 179ea547b46438000a60d6642ea3e09e SHA-1: 781145b55e07f3b630fbb18bfc2f21bad521e15a SHA-256: 4026a1cfcdda588da7dd735bee787e7a2d71fd89d1f4451ab9ba3ffb91c3da81
122 Risk Score

Malware Insights

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

The PDF document contains a lure for a game hack, presenting a fake CAPTCHA to trick users into clicking a malicious link. The embedded URL, https://netcdn.online/app/406889139/coin-master-2021-free-spins-link-blogspot-game-hack, is associated with this lure. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to exploit user interaction for potential further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/406889139/coin-master-2021-free-spins-link-blogspot-game-hack PDF link annotation
    • http://library.fisip.upnvj.ac.id/repository/tiktok-free-account_GM835599320.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/coin-master-hack-unlimited-spins-apk-download_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/unlimited-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/coin-master-free-shield-link_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/free-spins-coin-master-links-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/easy-roblox-today_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/how-do-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/minecraft-com-free_GM479516143.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/roblox-robux-generator-tool_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/mcpe-116_GM479516143.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/game-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/free-spins-coin-master-site-wwwquoracom_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005395.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5395 26828 bytes
SHA-256: 28fb636c0cf3efbe7dbbf4abc5695d329e2840a1bd65278373ba921b14872c3b
font_01_sfnt_off00008f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F84 4020 bytes
SHA-256: 7d3617ecf51e14e6cffc9372c4441988c3b6cb3ea010f7512aee6af842ef388d
font_02_sfnt_off00009d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D0F 19036 bytes
SHA-256: 29484b4ebf3793c9706388e12a4eb2d5c1ba7d7e7655f6e92dea7caed4d0fe01

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