Malicious PDF — malware analysis report

Static analysis result for SHA-256 780e12cbc5b6a1fe…

MALICIOUS

PDF

48.4 KB Created: 2021-06-03 21:04:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f9ddeba8f4dcdb99a174749310505832 SHA-1: fc6fcc81761fc5432c3ed46f7722dc2d5d559349 SHA-256: 780e12cbc5b6a1fe890b0fd214efafe6d4aa52f6648529b36c6f39c3b20d8512
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high-severity heuristic firing for a game hack redirector lure, pointing to a suspicious URL. The document body, though heavily obfuscated, contains references to game hacks and the same URL. This suggests the PDF is designed to trick users into clicking the link, which likely leads to a malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/406889139/coin-master-hack-android-no-root-game-hack PDF link annotation
    • https://kojak-group.com/userfiles/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/robux-earning-websites_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/win-free-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/robux-com-free_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-spins-coin-master-legit_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-hack-quora_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-32-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/rbx-free-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-group-roblox_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/minecraft-hacks-xbox-one_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-hack-coin-master-root_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052f2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52F2 26100 bytes
SHA-256: efe07c106c643421fd2581b0b5d11a7e9c4969030d33afa203115fedd57ffe3a
font_01_sfnt_off00008fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FB7 3380 bytes
SHA-256: 1dd933c112880b232546f3aab6a17784a8f412d39fd551cc6eb31c5a04c3ce57
font_02_sfnt_off00009ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BA0 17888 bytes
SHA-256: d995a490191476caf6036028eeb2fbdc741551af8ffc21687152d10b5db48049

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