Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99dee9138ad41c7…

MALICIOUS

PDF

35.4 KB Created: 2021-07-05 23:37:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 29390a3e87087dcb679e07569532d972 SHA-1: 2ff1ea3e7e75a003cf505b0cb13406ccd493d522 SHA-256: d99dee9138ad41c78aba69549909b9d1a105a50668470d32f4b012366e200e75
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector, specifically advertising 'free coins' and 'game hacks' for popular games. The primary link, http://netcdn.tw/app/406889139/free-coins-coin-master-spins-game-hack, is flagged by heuristics as a malicious redirector and a lure for game hacks. The document body also contains this URL, reinforcing the social engineering attempt to drive traffic to malicious sites.

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/free-coins-coin-master-spins-game-hack In PDF document text
    • https://opac.umrah.ac.id/repository/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/hack-cuentas-gratis-en-roblox-pastebin_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-robux-hack-xyz_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/can-i-get-a-hacked-roblox-account-back-without-email_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/i-got-hacked-in-wierd-writing-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/azure-download-roblox-hack_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-army-gfx-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-do-i-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-hat-free-2021_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/pubg-uc-top-up-center_GM1330123889.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-cheat-on-roblox-got-talent_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-minecraft-bedrock-server_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-crashes-when-i-open-cheat-engine_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-roblox-gfx-artists_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-roblox-gear_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/are-free-robux-games-real_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3398 23312 bytes
SHA-256: 6484a7c556f9d8cc6aa560de9b390facfa3a7560f8c6dd7ab46c0e36c0c3ceb8
font_01_sfnt_off00006849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6849 18176 bytes
SHA-256: 9c216cc6aa1e94c18ff26070eb99056dac407022fd31ef3f29cf2ac34e799f34

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