Malicious PDF — malware analysis report

Static analysis result for SHA-256 525b3d1ac1f72b25…

MALICIOUS

PDF

34.4 KB Created: 2021-06-21 01:37:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8fa579362e150aeb90817a305003ff6e SHA-1: 71d9d94cd1b4da7eb53c4fe8025bec8131ac88c2 SHA-256: 525b3d1ac1f72b25442c625a450c0ffdcc34f0950994850826c78429fb816565
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game currency and hacks to trick users into clicking malicious links. The embedded URLs lead to redirectors that host further malicious PDFs, indicating a multi-stage download or phishing campaign. The ML classifier strongly flagged this PDF as malicious.

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/how-to-get-free-robux-2021-no-scam-game-hack In PDF document text
    • http://bressanassessoria.com.br/images/script-hack-roblox-piece_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/coin-master-spin-link_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/roblox-contrasea-hack_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/how-to-get-a-free-shirt-on-roblox-without-bc_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/roblox-pokemon-brick-bronze-hack-legendary_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/roblox-free-gry_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/minecraft-free-play-now_GM479516143.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/how-to-get-free-spins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/minecraft-free_GM479516143.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/free-robux-2021-nov_GM431946152.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/can-i-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://bressanassessoria.com.br/images/how-to-log-out-of-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002eca.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2ECA 22048 bytes
SHA-256: 4996f00486b227bc35a3b3f51464f555d199a334a96fac614777caa80dcd6a64
font_01_sfnt_off00005f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9B 19648 bytes
SHA-256: 2147c94f58a846815c9a95b0f0aceefc669b5d019c62e7739653c796e4b0edbc

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