Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8e591d3c75695b…

MALICIOUS

PDF

47.5 KB Created: 2021-06-03 12:58:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: db9117bd29c35af48394ea06f75fc6fb SHA-1: c816cea149fa7769c6a56e8bc5be18c9579deb22 SHA-256: 4c8e591d3c75695b45cf2649a0bfb936f8c497f085cfe8bff7641fb17ecdb441
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on what appears to be a game hack or free currency generator. These links redirect to known malicious infrastructure, specifically the URL https://netcdn.online/app/406889139/coin-master-spin-hack-link-game-hack. The presence of these malicious redirector links and the ML classifier's high confidence score indicate a malicious intent to lead the user to a potentially harmful site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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 https://netcdn.online/app/406889139/coin-master-spin-hack-link-game-hack In PDF document text
    • http://digilibfisip.unla.ac.id/repository/pubg-uc-400_GM1330123889.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/7-year-old-roblox_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-legally-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/inappropriate-roblox-games_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/robux-game-com_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/hack-coin-master-using-cheat-engine_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/robux-com-free_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/teach-me-to-hack_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-robux-link_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-downgrade-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/dailyrobux_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/roblox-games-with-free-vip-servers_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/oprewards-points-generator_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000535c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x535C 25244 bytes
SHA-256: a611542f502a7ce0352d6a639d28d5838314464b95ed86a69f7a44979436dc3f
font_01_sfnt_off00008cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC9 3204 bytes
SHA-256: 8dadd637b2444b10e7c800e03d6b29fa29c8c4cabd7e1b0e4e0788863f313611
font_02_sfnt_off000097cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97CD 17892 bytes
SHA-256: 7f3ff29013eb9f1a81458cbc85dd3db40ecf793c6bb68bdfdc199744a029032c

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