Malicious PDF — malware analysis report

Static analysis result for SHA-256 c819b27169dd8f16…

MALICIOUS

PDF

33.9 KB Created: 2021-07-06 09:18:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 904358713d448d9e38f48533772a99fe SHA-1: c270970024998f837ea40365416bc5a74300e00d SHA-256: c819b27169dd8f16c3bb444a6ba4fbc77e38aa6912dbd2f1cbb324a467080830
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized and point to game hacks and free accounts for popular games like Coin Master and Roblox. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests a phishing or scam campaign designed to drive traffic to potentially malicious or deceptive content. No scripts were extracted, but the embedded URLs and the heuristic findings indicate a lure-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-free-gifts-game-hack
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/play-roblox-for-free-on-google_GM431946152.pdf
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/how-to-hack-the-creater-roblox_GM431946152.pdf
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/coin-master-free-spins-today-daily-links_GM406889139.pdf
    • http://perpustakaan.pt-yogyakarta.go.id/lib//repository/coin-master-links-for-today_GM406889139.pdf
    • http://perpustakaan.pt-yogyakarta.go.id/lib//repository/coin-master-hack-no-human-verification-2021_GM406889139.pdf
    • http://perpustakaan.pt-yogyakarta.go.id/lib//repository/free-roblox-accounts_GM431946152.pdf
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/www-free-robux_GM431946152.pdf
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/how-to-hack-into-the-buildings-of-jailbreak-roblox_GM431946152.pdf
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/websites-that-get-you-free-robux_GM431946152.pdf
    • http://perpustakaan.pt-yogyakarta.go.id/lib//repository/minecraft-that-you-can-play-for-free_GM479516143.pdf
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/http-bitly-coin-master-free-2021-spins_GM406889139.pdf
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/roblox-prison-life-glitches-and-hacks_GM431946152.pdf
    • http://perpustakaan.pt-yogyakarta.go.id/lib//repository/coin-master-free-spins-link-2021-march_GM406889139.pdf
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/boku-no-roblox-remastered-buy-hack-sellygg_GM431946152.pdf
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/free-roblox-redeem-codes-2021_GM431946152.pdf
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/how-to-get-roblox-admin-for-free_GM431946152.pdf
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/god-mode-dll-hack-roblox_GM431946152.pdf
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/free-robux-no-email-or-human-verification_GM431946152.pdf
    • http://perpustakaan.pt-yogyakarta.go.id/lib/repository/robux-hack-script-in-inspect-code_GM431946152.pdf
    • http://perpustakaan.pt-yogyakarta.go.id/lib//repository/spins-for-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030d3.bin
871052a808d50a7377187c3c933dfdf098cdc12c44ab8903daaee16e82c355eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x30D3 22360 bytes
font_01_sfnt_off000062a1.bin
0554876b2ab95b57b2a8903cbabfbfa90e4f9f04422ab63317bc25d957b52972		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62A1 17996 bytes

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