Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e9f449b519ee52…

MALICIOUS

PDF

45.2 KB Created: 2021-06-03 11:16:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5479dda737d00c9b7154a9bb7eefed0c SHA-1: 972c15e3906ddeae7310b6b32a58d8500f329fb7 SHA-256: c5e9f449b519ee52500f6eafefadd2ad51297ad23fde16dfa194bd6a3c297b6b
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a high-severity heuristic indicating it links to a "free generator / game hack" lure, impersonating the Facebook brand. The primary URL, https://netcdn.online/app/406889139/coin-master-free-spins-link-2021-haktuts-game-hack, is presented as a call-to-action, suggesting a credential phishing or malware download attempt. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a malicious intent.

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.online/app/406889139/coin-master-free-spins-link-2021-haktuts-game-hack.
  • 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-free-spins-link-2021-haktuts-game-hack PDF link annotation
    • http://library.futureuniversity.com/repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-robux-please_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-robux-site_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-hack-using-cheat-engine_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-roblox-svg_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-many-levels-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-minecraft-windows-10-with-java_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/get-free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-hack-pc-cheat-engine_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_off0000536a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x536A 25384 bytes
SHA-256: fc52c0fc30400cc456bded70abc029edc6170826d4a37c55bb5bb736f536073d
font_01_sfnt_off00008cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CFF 18600 bytes
SHA-256: 17fca5a110173985813f3878a6a354acd9691d8bd8a3bfb3ba74e1722aeabc4d

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