Malicious PDF — malware analysis report

Static analysis result for SHA-256 634b38331b9e1f81…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 17:26:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: adecc8f71f7a18845b469c52fa4c00ed SHA-1: ed11a7bf844a5545d27f32fe7cad707bef805578 SHA-256: 634b38331b9e1f81f40d63d4a947328403e3477f46886180267134643a94fbeb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including a known malicious redirector, under the guise of providing game hacks and free spins. The primary link, http://netcdn.tw/app/406889139/how-to-get-free-spins-in-coin-master-game-hack, is identified as a lure for game-related cheats. The presence of multiple redirector links suggests an attempt to lead the user to a malicious payload or phishing site. No scripts were extracted, but the document structure and embedded URLs strongly indicate a phishing or malware distribution 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/how-to-get-free-spins-in-coin-master-game-hack In PDF document text
    • http://opac.library.uib.ac.id/repository/hack-for-roblox-free_GM431946152.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/free-minecraft-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/hack-para-cambiar-tu-nombre-en-roblox_GM431946152.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/coin-master-free-cards-link-2021-today_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/free-roblox-girl-hair-not-a-model_GM431946152.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/coin-master-hack-software_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/card-hack-in-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/roblox-moderators_GM431946152.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/coin-master-game-hacking-tricks_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/como-generar-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://opac.library.uib.ac.id//repository/free-spins-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://opac.library.uib.ac.id/repository/extra-free-spins-for-coin-master_GM406889139.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
stream_002_off000031bc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31BC 22884 bytes
SHA-256: eb9e310d7e4e610942e770154a6f186650b7396915eb708858b615a7a1731cf3
font_01_sfnt_off0000651c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x651C 18336 bytes
SHA-256: 11de4304e4fdf887d410d1e4a25cee46ae29c04a9263dbbe12b650d8207992b4

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