Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c61d73b816a86cb…

MALICIOUS

PDF

34.0 KB Created: 2021-07-06 12:43:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5efdb18f48decefaca2f56f100fa0970 SHA-1: ca9b9b5d5473cbee3d63904d4131db1d376c739e SHA-256: 7c61d73b816a86cb49f5ba8d6406a26488bf51d5a8c42f252030e8f4b680e8fa
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically promoting 'free generators' or 'game hacks' for popular games. The primary malicious link identified is http://netcdn.tw/app/479516143/minecraft-free-reddit-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a lure to a potentially malicious website, likely for credential harvesting or further malware delivery.

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/479516143/minecraft-free-reddit-game-hack In PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-robux-site_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-gifts-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/hack-coin-master-for-android_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/minecraft-hacks-for-2b2t_GM479516143.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-apk-free-download_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-level-3_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/roblox-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-hack-android_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/minecraft-116-free-download_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_off00003204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3204 22172 bytes
SHA-256: 981dd871be7072992178003417e5a1436b20bda13cfeacd16ae936c6b8ead6ef
font_01_sfnt_off00006325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6325 18028 bytes
SHA-256: 643495630a0e2882763c76801d421163758b25dda5a584bed505c907634fa296

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