Malicious PDF — malware analysis report

Static analysis result for SHA-256 61423d8fe1c5a59b…

MALICIOUS

PDF

44.2 KB Created: 2021-06-11 06:52:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 409e8a611e12d95bbad7872956737768 SHA-1: c8fdbd4296b9db2fcd70543cf951dfbde4b6b442 SHA-256: 61423d8fe1c5a59bc5d2a818ea8c53c7fbe5b0ef09c34dc0059cb75c6b948a1b
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 0.9865

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.tw/app/431946152/how-to-change-name-for-free-roblox-game-hack PDF link annotation
    • https://pt-mataram.go.id/perpustakaan/repository/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/free-spins-coin-master-2021-no-verification_GM406889139.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/can-you-give-me-robux_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/tiktok-free-20-likes_GM835599320.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/minecraft-for-macbook-free_GM479516143.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/free-roblox-clothes-templates_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/coin-master-free-food_GM406889139.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/how-to-earn-robux-fast_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/coin-master-levels_GM406889139.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/lucky-patcher-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/free-cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/hack-minecraft_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
font_00_sfnt_off000050f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50F6 24176 bytes
SHA-256: 328f778375356154b011a2f4cba2f9dfbad7e76a88227dcf87b936c3a9aa9f2e
font_01_sfnt_off0000881c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x881C 19056 bytes
SHA-256: c0a40b94666944e3f3d6356aa607d0f0dbdf76fad85b9073eb819dcf1d380d22

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