Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ff21af6c979b79…

MALICIOUS

PDF

34.9 KB Created: 2021-07-08 23:49:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-07-01
MD5: 26a85d956079efbd2ff7931454432bc8 SHA-1: 4be737a3199be2e416e0dd3371b2fd735fda8079 SHA-256: a4ff21af6c979b79ecb419066db22de45040213db9535bc1b5b6758e600bcb5a
160 Risk Score

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/free-spins-and-coins-from-coin-master-game-game-hack In PDF document text
    • http://sd-olimp.hr/files/descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/free-robux-only-username-and-password_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/how-to-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://sd-olimp.hr/files/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/free-roblox-accounts-dantdm_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/nuevo-hack-para-dragon-ball-rage-cesarius-roblox_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/free-spins-coin-master-links-thursday-november-28-2021_GM406889139.pdfIn PDF document text
    • http://sd-olimp.hr/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://sd-olimp.hr/files/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/www-roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/instant-robux_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/roblox-free-items-2021_GM431946152.pdfIn PDF document text
    • http://sd-olimp.hr/files/free-robux-today-ad_GM431946152.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/static-moonactive-net-free-spins_GM406889139.pdfIn PDF document text
    • http://sd-olimp.hr/files/coin-master-link-today_GM406889139.pdfIn PDF document text
    • https://www.sd-olimp.hr/files/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn extracted file (font_00_sfnt_off0000315a.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000315a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x315A 23016 bytes
SHA-256: 846f7fa4afb96192c80cec1f3bbf57231be31ed6948f248e7f2f1f37e2fdc449
font_01_sfnt_off0000650a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x650A 18608 bytes
SHA-256: 2dc78bc9bcc4ebdd572802885893151c1e8df498be6c3c290a8f513ae15145fe