Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6c230e07cb8165…

MALICIOUS

PDF

34.9 KB Created: 2021-07-07 19:26:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c5e57c31c3b6eaf36d4bad0cfb54975a SHA-1: b6203f753e34717de693e7c5ef8acc831965bf95 SHA-256: ad6c230e07cb81656d3d9c00204687aaf1f163d35c1ea4d63eb7806013f11ef5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising 'free generators' and 'hacks' for popular games. The primary redirect URL is http://netcdn.tw/app/406889139/coin-master-free-spins-daily-game-hack. This indicates a social engineering lure designed to trick users into visiting potentially harmful sites. No scripts were extracted, but the embedded URLs and heuristic firings strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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-spins-daily-game-hack In PDF document text
    • https://www.knjigebuducnosti.com/files/50-000-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-house-for-meep-city-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/youtube-how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/www-roblox-com-sign-up-for-free_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/roblox-hack-download-explode_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/archery-master-3d-apk-and-mod-free-download-unlimited-coins_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/wall-hacks-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/coin-master-card-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-robux-eoblox-fiddler_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/roblox-cubes-of-god-hacks_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/free-disney-plus-accounts-tiktok_GM835599320.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • https://www.knjigebuducnosti.com/files/how-to-get-free-shirts-on-roblox_GM431946152.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_off00003166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3166 22896 bytes
SHA-256: 1f5be8fb9cd6955d495f8701da743b2a5aa867a34b7417498589797240e86eb3
font_01_sfnt_off000064b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B1 18596 bytes
SHA-256: 9b8358e598e07f7d28a63a566b047adfcbccaa59c97f3816d59e3cdcc62e8d14

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