Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d1501508161c8e…

MALICIOUS

PDF

35.4 KB Created: 2021-07-04 20:22:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 660d6bc362f041d6b2ca6f23c04a4660 SHA-1: 48b32995b31f74de3c0098b0eb0f3df0242e707c SHA-256: d8d1501508161c8e70897139b339115e3ddaa3f47e9efe936d9f3cff13f61758
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirector infrastructure, specifically advertising 'free generators' and 'game hacks' for popular games like Roblox. The primary malicious URL identified is http://netcdn.tw/app/431946152/roblox-free-no-download-game-hack. This indicates a social engineering lure designed to trick users into visiting potentially harmful websites. No scripts were extracted, but the presence of embedded URLs and the ML classifier strongly suggest malicious intent.

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/431946152/roblox-free-no-download-game-hack In PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/cheat-engine-30-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/oprewards-login_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-money-hack-cheat-engine-64_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/free-roblox-shirt-templates-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/robux-recharge-hack_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-youtube-tiktok_GM835599320.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/hack-roblox-servers_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/coin-master-free-spins-23-march-2021_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/does-coin-master-hack-work_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/tiktok-free-view-iphone-7-plus_GM835599320.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id//repository/coin-master-hack-download_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/promocodes-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-how-to-be-copletely-white-character-free_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/xonnek-roblox-jailbreak-hacks_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-free-admin-dll_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/dungeon-quest-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.unda.ac.id/repository/roblox-generator-com_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_off0000319b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x319B 22960 bytes
SHA-256: 2f12fefcc577e2635e8ae4602efc15c9b1993f72c4ff1fac784b3865ef4dd33b
font_01_sfnt_off00006505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6505 19156 bytes
SHA-256: ba179ae70ead152b01ae8f27451fe6f8d609efa6e1c0129b35fe0e54807ded44

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