Malicious PDF — malware analysis report

Static analysis result for SHA-256 4255a58f26496257…

MALICIOUS

PDF

47.7 KB Created: 2021-06-11 05:41:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-15
MD5: 4c0ae6e2a859353b327cbb8c592bbe10 SHA-1: 8cd6358802ac7a2a22e2f9d82c6287da0103dcbf SHA-256: 4255a58f264962578bd00b59ff205d28a286068f56bb28d4a2671426d41b67ed
260 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/how-to-get-wings-for-free-in-roblox-game-hack In PDF document text
    • https://library.uigm.ac.id/repository/free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-golden-cards-hack_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/earn-robux-online_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-be-a-admin-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/robux-free-xyz_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/pastebin-free-robux-no-waiting_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-hack-ios-app_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-piano-monody-hack-delay_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/daily-spin-coin-master-free_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/is-coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-get-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/ahk-roblox-hack_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-get-a-refund-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-do-attack-seed-hack-roblox_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/minecraft-xbox-360-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5106 25796 bytes
SHA-256: f421d92e0d3265fa462ab64269c6fc886425f8017bfe5bf773391d97dd75500c
font_01_sfnt_off00008c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C5F 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off000095ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95FF 18824 bytes
SHA-256: 284f1fc6fdc036725aecefe788a46f671c17131b6e1bab53257c220bfab8db60

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