Malicious PDF — malware analysis report

Static analysis result for SHA-256 6657a7855a07798d…

MALICIOUS

PDF

43.5 KB Created: 2021-06-03 18:55:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: fb67f008b330743ecf4266b5ec872a08 SHA-1: 0678f68368f61cf2c8f9142febe97456f23038bf SHA-256: 6657a7855a07798db6547ab2093fddbc33532f3a2a6b0ed6dd26e89aafdc43ce
200 Risk Score

Malware Insights

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

The PDF contains a fake CAPTCHA lure and multiple links to a known malicious redirector infrastructure. The primary link, https://netcdn.online/app/406889139/cm-free-spin-link-today-game-hack, is designed to trick users into clicking it under the guise of a 'free generator' or 'game hack'. This likely leads to a second-stage download or exploit. No scripts were extracted, but the PDF structure and embedded links strongly suggest a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/cm-free-spin-link-today-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/robux-free-c_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-food_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-bedrock-hacks-windows-10_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-heaven-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-cute-girl-outfits-for-free_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-pc-hack_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-game-hack-online_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-coins-coin-master-blog_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_off000050be.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50BE 23764 bytes
SHA-256: 82652c95a8d9ebc78352384cfce2dba138fbfb6defd58ca0a1f934126e6d81eb
font_01_sfnt_off0000868b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x868B 18568 bytes
SHA-256: 25a2ee2baa32fb86b83e2840a58348e17ba7953b286ca82cf9f97985fc172f08

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