Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b8e0992ef8bf62…

MALICIOUS

PDF

33.9 KB Created: 2021-07-05 21:30:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f26de2766d48de2a1785420aa3a606b8 SHA-1: 6503719baafc89ce0280ebb3d7e98ec09a741e0d SHA-256: c4b8e0992ef8bf627b006b16e0b3f0cc1cda663c2b782d3b455318307cec4a01
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 4

  • 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.
  • 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/406889139/coin-master-viking-quest-hack-game-hack PDF link annotation
    • http://www.library.umbjm.ac.id/repository/minecraft-tower-defense-hacked_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-link_GM431946152.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/roblox-account-stealing-hack-by-kingtennisbal_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-in-a-game-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-windows-10-edition-free_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-launcher-free_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-stuff-on-roblox-webste_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/robux-hack-github_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-mod-apk-unlimited-spin-download-free-full-version_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-jailbreak-how-to-get-free-lamborgini_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/tiktok-likes-free_GM835599320.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_002_off00002eab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2EAB 22560 bytes
SHA-256: 5298e5d894a3b7814ececc298e917580edc50275a6e82e743ff2f37ac22e0cb7
font_01_sfnt_off000060e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60E1 18436 bytes
SHA-256: 5ec41fe137d6e03b9edd903e38f7fd84a5baa59858375f92b2dc397b9932153f

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