Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ff42c90ed0fa59…

MALICIOUS

PDF

34.9 KB Created: 2021-07-08 23:17:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-07-01
MD5: f82bd990aa764fb4eac5ff109b88acc7 SHA-1: 594bbfd2dc319904ff4bc28e29e908bd4a75a389 SHA-256: a4ff42c90ed0fa59baa245a9387390b5a58c3b8abfdad87fed3352f74313bbae
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/431946152/how-to-get-free-robux-hack-2021-game-hack In PDF document text
    • http://cintabaca.org/katalog/repository/dayz-cheat-codes-roblox_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-hack-stats-in-dragon-ball-ultimate-warriors-roblox_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-do-you-hack-roblox-to-have-sex_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-pet-food-coin-master_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-free-spins-daily-1-ga_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-free-skins-in-roblox_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-free-robux-no-inspect-no-waiting_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/reddit-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/get-action-hair-free-roblox_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-coins-and-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/vip-roblox-free_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/robux-free-roblox-update_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/hack-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/how-to-get-free-coins-in-coin-master-game_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/all-hack-week-2021-projects-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn extracted file (font_00_sfnt_off0000310e.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000310e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x310E 22020 bytes
SHA-256: 3c06714aeff806bd63d6f3eab83f1037222731349f88627ff0fc454b1e15a6a8
font_01_sfnt_off000061a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A3 19556 bytes
SHA-256: f212cd4c9928ae438aa9e71512a10d010177ec0841fcd267cfedc658cf456714