Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c41159501d97752…

MALICIOUS

PDF

35.3 KB Created: 2021-07-05 10:56:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 68be40e8b5d8739c5873e66ca3333262 SHA-1: c88017b166f0c96c8cca50b8aa5a92b1f5e4ef29 SHA-256: 6c41159501d9775269efffb7aa86a3138b577c9b8f8de161791edee840bd7aad
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to a known malicious redirector infrastructure, specifically advertising 'Coin Master Free Spins Link Download Hack'. The document body and heuristics confirm the lure is for game-related cheats, which is a common social engineering tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector is the embedded malicious URL.

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-free-spins-link-download-hack-game-hack In PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/minecraft-packs-free_GM479516143.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/free-robux-and-tix-generator-no-survey-or-download_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/free-robux-online-generator-2021_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/minecraft-thumbnail-maker-free_GM479516143.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/rc7-free-download-hex-blade-roblox_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/how-to-get-a-free-private-server-on-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/apps-cheat-roblox-hack-2021-cheats-online_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/coin-master-hack-download-ios_GM406889139.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/free-spin-and-coin-blogspot_GM406889139.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/get-free-spins-coin-master-october-2021_GM406889139.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/roblox-hack-app_GM431946152.pdfIn PDF document text
    • https://pt-mataram.go.id/perpustakaan/repository/free-roblox-accounts-that-work_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
stream_002_off0000339e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x339E 22528 bytes
SHA-256: 8919e150ee38d5b28b69d045038a351b18086a1cd795a1fac1237aa05abf42cb
font_01_sfnt_off0000656d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x656D 18924 bytes
SHA-256: e987de95c71b54d77bff4d31366d2d96c0c1c0c84cc5d45c6fa9b96ee99b38ec

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