Malicious PDF — malware analysis report

Static analysis result for SHA-256 8598cd86cf510e54…

MALICIOUS

PDF

48.0 KB Created: 2021-06-11 00:32:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 747413593f10f90105e5601c95b954c4 SHA-1: 2f9ca1e0b0cc6d8febf8527b171dee894522d1ae SHA-256: 8598cd86cf510e549ffa8c4adb82272a920f6b1bf673c916b0e9fe42a53d3778
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically disguised as 'free generator' or 'game hack' lures. The ML classifier also flagged this PDF with high confidence. While no scripts were extracted, the embedded URLs and the nature of the lures strongly suggest an attempt to redirect the user to a site that will likely host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/free-roblox-games-without-signing-in-game-hack In PDF document text
    • https://www.croydex.com/uploads/files/files/_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/100-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/mcpe-download_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-tiktok-followers-no-human-verification-or-survey_GM835599320.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-game-free-download-for-pc_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-hair-for-free_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-hack-october-2021_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-roblox-script-obfuscator_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-rape_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/minecraft-hacker-mask_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-400-spin-link-hack_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-roblox-script-executor_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-phantom-forces-money-hack_GM431946152.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_004_off00004fca.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FCA 25692 bytes
SHA-256: c3cfc916fd87ca103c0e5ce7da906ab98efd2a08e5c05d7e2c36a7e6cef2fb7b
font_01_sfnt_off00008b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B77 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off00009586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9586 19452 bytes
SHA-256: b649af21f239c8fcbb4b5405a7796f9d2faa124ae83db87d37ee8dc921d05d74