Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66998b650fc8e1b…

MALICIOUS

PDF

35.0 KB Created: 2021-06-28 13:35:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0b2bf87f203756d1e755c01c5e67543e SHA-1: a51dd69ee84df2b3a7709a77965e15ea68ebcd2f SHA-256: a66998b650fc8e1b91352e95f6b96296e173cc3cf9224e8f1bd29e21af275701
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, masquerading as game hacks and generators. The primary lure is a "free generator / game hack" promising "free robux" for Roblox, which is a common social engineering tactic. The document body and heuristics confirm the malicious redirection and the use of a download button lure.

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.co/app/431946152/cheat-in-roblox-free-robux-pc-no-verification-game-hack In PDF document text
    • http://www.lorengntt.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-link-iphone_GM406889139.pdfIn PDF document text
    • http://www.lorengntt.com/new/public/ckfinder/userfiles/files/free-robux-kingdom_GM431946152.pdfIn PDF document text
    • http://www.lorengntt.com/new/public/ckfinder/userfiles/files/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://www.lorengntt.com/new/public/ckfinder/userfiles/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.lorengntt.com/new/public/ckfinder/userfiles/files/how-to-get-free-robux-gift-cards-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.lorengntt.com/new/public/ckfinder/userfiles/files/roblox-paintball-hack-download_GM431946152.pdfIn PDF document text
    • http://www.lorengntt.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.lorengntt.com/new/public/ckfinder/userfiles/files/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • http://www.lorengntt.com/new/public/ckfinder/userfiles/files/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://www.lorengntt.com/new/public/ckfinder/userfiles/files/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://www.lorengntt.com/new/public/ckfinder/userfiles/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://www.lorengntt.com/new/public/ckfinder/userfiles/files/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • http://www.lorengntt.com/new/public/ckfinder/userfiles/files/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.lorengntt.com/new/public/ckfinder/userfiles/files/free-stuf-in-robux-calgot_GM431946152.pdfIn PDF document text
    • http://www.lorengntt.com/new/public/ckfinder/userfiles/files/coin-master-hack-without-verify_GM406889139.pdfIn PDF document text
    • http://www.lorengntt.com/new/public/ckfinder/userfiles/files/no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.lorengntt.com/new/public/ckfinder/userfiles/files/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.lorengntt.com/new/public/ckfinder/userfiles/files/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.lorengntt.com/new/public/ckfinder/userfiles/files/how-to-get-minecraft-bedrock-edition-on-pc-for-free_GM479516143.pdfIn PDF document text
    • http://www.lorengntt.com/new/public/ckfinder/userfiles/files/roblox-sites-that-give-you-free-robux_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
font_00_sfnt_off00003117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3117 22336 bytes
SHA-256: 43760c85f8d5dbbf1190e3050f9df29c230d4d9dc44f12a73329e992254f74ce
font_01_sfnt_off00006297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6297 19468 bytes
SHA-256: 1c39adec89b489b10534bef6eb466cb72f90dd281e8d51ba858c0946ec80a828