Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20fcacfd777a795…

MALICIOUS

PDF

36.3 KB Created: 2021-07-09 13:07:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ae132a9150955cae77f39711548f100e SHA-1: 6b28c64c3bc111cb8f549ecd315780be2bae37ec SHA-256: c20fcacfd777a79525c16682e98f1d8c7fd28654bfc19a346d66fa4465ace843
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it links to malicious redirector infrastructure, specifically promoting a "game hack" generator. The embedded URL http://netcdn.tw/app/406889139/coin-master-mod-apk-latest-version-free-download-game-hack is identified as a malicious redirector. The document body also contains this URL and other links to potentially malicious PDF files, suggesting 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-mod-apk-latest-version-free-download-game-hack In PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/roblox-free-play_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/veichle-simulator-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/how-to-earn-robux_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-superhero-skin-roblox_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-tiktok-like_GM835599320.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/minecraft-free-demo_GM479516143.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-credit-cards-for-robux_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/goud-info-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-roblox-hair-girl_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/synapse-download-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/gravity-switch-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/get-free-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/how-to-get-admin-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/bleu-hack-roblox-download-free_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-robux-survey_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/how-do-you-hack-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/hacker-destroza-la-ciudad-roblox-pokemon-gomiannn_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_off00003775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3775 22348 bytes
SHA-256: 7859dfe9c5b833c89ffca96c3913e0dff3c99cc271a5aecd32adb26989ddc122
font_01_sfnt_off000068ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68FF 19060 bytes
SHA-256: 5bb4a7f404b467da3ea0089e53a7d43d95ff8f502634d4953fb8ca32fd81900c