Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d5ed5ea9836456…

MALICIOUS

PDF

43.3 KB Created: 2021-05-13 14:33:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3e6ca42298587c94f16ac228a7dffe49 SHA-1: 2b246132084a618546b62b8245a2dcac973437d6 SHA-256: 66d5ed5ea9836456e0b125a049b3cb02284744e50e376dd0e1f8e1ca25f3985b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as "free generator" or "game hack" lures. These links ultimately lead to other malicious PDF files hosted on the teknotools.net domain. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/free-robux-websites-that-actually-work-game-hack In PDF document text
    • http://teknotools.net/images/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://teknotools.net/images/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://teknotools.net/images/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • http://teknotools.net/images/minecraft-games-free-to-play-online_GM479516143.pdfIn PDF document text
    • http://teknotools.net/images/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://teknotools.net/images/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://teknotools.net/images/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://teknotools.net/images/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://teknotools.net/images/minecraft-for-free-apk_GM479516143.pdfIn PDF document text
    • http://teknotools.net/images/minecraft-free-app_GM479516143.pdfIn PDF document text
    • http://teknotools.net/images/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://teknotools.net/images/get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://teknotools.net/images/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://teknotools.net/images/minecraft-112-hacked-client_GM479516143.pdfIn PDF document text
    • http://teknotools.net/images/http-blackgamesus-coinmasterhack_GM406889139.pdfIn PDF document text
    • http://teknotools.net/images/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://teknotools.net/images/coin-master-hack-2021-apk-download_GM406889139.pdfIn PDF document text
    • http://teknotools.net/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://teknotools.net/images/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://teknotools.net/images/roblox-free-robux-no-human-verification_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_003_off0000498b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x498B 25324 bytes
SHA-256: 345d8da1d4f8860b6df2a9f13fafcb36c095de6960bbe00b1a6133d813b7716f
font_01_sfnt_off000083ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83EF 19252 bytes
SHA-256: f49525d2cb353299e95430044cca9c62699809686ebb763340304ea0e82a2cbb

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