Malicious PDF — malware analysis report

Static analysis result for SHA-256 64395e4d1afc9109…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 06:13:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4b6f732d4c1b514d8d996a262fac3eee SHA-1: 998af6bde582bb8fcd2942615711fd8856396518 SHA-256: 64395e4d1afc91097004bddf88df9cbb58e60b54464c15a8685a066f5f9e16bf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with a primary link pointing to a known malicious redirector. The document body and heuristics indicate a lure for 'free Robux' or game hacks, designed to trick users into visiting the malicious URL. The ML classifier strongly supports the malicious nature of this PDF.

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/431946152/free-robux-gen-game-hack In PDF document text
    • https://www.knjiznica-oroslavje.hr/files/tiktok-free-music-library_GM835599320.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-robux-come_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/when-was-minecraft-free_GM479516143.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/roblox-com-cheat_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/hack-robux_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/download-robux-hack-no-downlowdes_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-roblox-accounts-2021-august_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-roblox-premium_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/free-spins-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/roblox-premium-free_GM431946152.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/pubg-uc-uk_GM1330123889.pdfIn PDF document text
    • https://www.knjiznica-oroslavje.hr/files/roblox-cheat-island-tribes_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/robux-free-com_GM431946152.pdfIn PDF document text
    • http://knjiznica-oroslavje.hr/files/coin-master-daily-free-spins-link-today-twitter_GM406889139.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_off00003181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3181 22416 bytes
SHA-256: c958cf24a0aaee819c82581f37bcf55c8bd1e542d9011e6ef387290b7fd105cd
font_01_sfnt_off0000637b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x637B 18716 bytes
SHA-256: 241c7495b7b7869825a77847e0d47c1d78029990e0b32ebb48689777b4105741