Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c2b9f1052dc3ab…

MALICIOUS

PDF

44.0 KB Created: 2021-05-14 11:36:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3fde9243573ea0e64882b4ab63f7356a SHA-1: b457a30cd929c481e73709ccca636eb3720c7a19 SHA-256: e3c2b9f1052dc3ab4dfad7ecf5fb8411692fe85b5f74aa234e9bdb6aac09089c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting "free generator / game hack" lures. The primary redirector identified is https://netcdn.xyz/app/406889139/coin-master-free-spins-link-2021-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious redirector workflow, likely intended to lead users to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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 https://netcdn.xyz/app/406889139/coin-master-free-spins-link-2021-game-hack In PDF document text
    • http://vostokbg.ru/images/get-robux_GM431946152.pdfIn PDF document text
    • http://vostokbg.ru/images/app-store-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://vostokbg.ru/images/hack-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://vostokbg.ru/images/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://vostokbg.ru/images/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://vostokbg.ru/images/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://vostokbg.ru/images/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://vostokbg.ru/images/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://vostokbg.ru/images/coin-master-daily-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://vostokbg.ru/images/free-free-robux_GM431946152.pdfIn PDF document text
    • http://vostokbg.ru/images/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • http://vostokbg.ru/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://vostokbg.ru/images/free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://vostokbg.ru/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://vostokbg.ru/images/roblox-gift-card-free-codes_GM431946152.pdfIn PDF document text
    • http://vostokbg.ru/images/free-coin-spin-daily-link-net_GM406889139.pdfIn PDF document text
    • http://vostokbg.ru/images/coin-master-free-spin-and-coin-link-app_GM406889139.pdfIn PDF document text
    • http://vostokbg.ru/images/rbx-sites_GM431946152.pdfIn PDF document text
    • http://vostokbg.ru/images/minecraft-free-education_GM479516143.pdfIn PDF document text
    • http://vostokbg.ru/images/coin-master-hack-apk-android_GM406889139.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
stream_003_off000047da.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47DA 24212 bytes
SHA-256: 8e6e90fcf503e2d1152ddd705cdac4ba7cbe0de6e17c925c910170551a1597bc
font_01_sfnt_off00007eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EEC 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off0000889d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x889D 18456 bytes
SHA-256: 405c435adaafa0da304b7a4986d8f56c56dc87ed278d5cff2ac0c57977d8d7e3

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