Malicious PDF — malware analysis report

Static analysis result for SHA-256 c337e529976c6bb9…

MALICIOUS

PDF

41.1 KB Created: 2021-05-15 14:36:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3004af3d71edd75f0c7e019c190d4e7d SHA-1: 9c09e5f54d919b74ed48a2f1df32392bfb774ea0 SHA-256: c337e529976c6bb9cb41e2cfe0e0f405335fa26eae75cbdfbefe37a870e84bef
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 0.9971

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 https://netcdn.xyz/app/406889139/free-coins-coin-master-2021-game-hack PDF link annotation
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/claimrobux-net_GM431946152.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/my-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/get-free-spins-coin-master-october-2021_GM406889139.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-game-free_GM406889139.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-weird_GM431946152.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/microsoft-bing-robux_GM431946152.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-latest-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/free-spin-link-for-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://www.st-augustines.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-minecraft-windows-10-for-free-with-java_GM479516143.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_003_off00004883.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4883 23928 bytes
SHA-256: 03cdadc30a39590a78bef0dc9647c751747cf9f27bc6814b67944a64d50ac382
font_01_sfnt_off00007ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC6 18112 bytes
SHA-256: 0727bd4027d3f5eec951b181c2bc31ee4d98e10eed2c862aff41d240a04f60ea

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