Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae81c4a25e8b191…

MALICIOUS

PDF

35.4 KB Created: 2021-07-09 02:14:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5f9376f34c0c915e6a5f7ce5d0824829 SHA-1: 42004f2e19cea1b865ae723c501a9dd1bce3e504 SHA-256: 4ae81c4a25e8b191ae1c051a2251a791a0b542f9c95a33aa16005b2d70e48ee5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains multiple links to a known malicious redirector, specifically advertising 'free generator / game hack' lures. The document body also contains the primary malicious URL, reinforcing the lure. The ML classifier also flagged this PDF with high confidence.

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/479516143/can-you-download-minecraft-for-free-game-hack In PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/minecraft-hacker-skin_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/robux-gift-card-free-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-project-pokemon-hack-script_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-robux-without-human-verification-on-ios_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-robux-hack-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/it-free-movie-musica-roblox_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-free-gift-link-2021_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/robux-com-free_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/cm-free-spin-link-today_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-roblox-website_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-v3rmillion-khol-admin-hack_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/guuudd-info-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000032f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32F0 23088 bytes
SHA-256: 33619d2f099172c8d55a4d37ee736b08b181aeaa79d040a4bef87de61e3aa3f7
font_01_sfnt_off00006605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6605 18880 bytes
SHA-256: d04a507d3641779a3965f5a6b6e6dd9ade08e797d0958b4441090374282c4c7c