Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3bf94c6fb3ee88…

MALICIOUS

PDF

48.9 KB Created: 2021-06-10 14:45:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5b7819f38f9134947a192e815e11a733 SHA-1: c3310062a873d66111f34fd625d7e62809c62c35 SHA-256: 4f3bf94c6fb3ee88382170776a4e0735d90ae056431ec3b65a0aeeefe1873dd4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising game hacks and free currency generators. The heuristic firings indicate the document is designed as a lure to trick users into visiting these malicious sites. Although no scripts were explicitly extracted, the nature of the links and the lure suggest a potential for further malicious activity, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/roblox-kat-hacks-game-hack In PDF document text
    • http://library.itekes-bali.ac.id/repository/free-roblox-card-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/real-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-spin-whatsapp-group-link_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-roblox-clothes-no-decals_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-hacks-no-downloading_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/pubg-uc-60_GM1330123889.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-game-hack-online_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-free-robux-in-roblox-2021-may_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-spins-link-june-2021_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-maps-pe-free-download_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-spins-on-coin-master_GM406889139.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_off000050e7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50E7 27100 bytes
SHA-256: 77143ba305a94284a32e63bb90405d4d1e9830fe2aa7132aad3f7b3cb64b78f0
font_01_sfnt_off00008f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F79 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00009c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C21 18284 bytes
SHA-256: c2c6d7624bb7c70c1625409d806cc5a7469de7cab080ca58cc380c8af24fd4ee

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