Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5491181854cb8b0…

MALICIOUS

PDF

33.6 KB Created: 2021-07-03 12:33:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 63f4eec2b88987589e74fbbe319a711a SHA-1: ed09764c493c7afdd0817b01d876c29dc819e920 SHA-256: d5491181854cb8b07e0a83527e98b66530b1ad7dda2bc22201f95032d6f75d6d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and embedded text promoting 'free generator / game hack' lures, specifically targeting popular games like Roblox and Coin Master. The primary link, http://netcdn.tw/app/431946152/free-robux-apk-game-hack, is identified as a malicious redirector. This suggests the document's purpose is to trick users into visiting malicious sites, likely to download further malware or engage in scams.

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/431946152/free-robux-apk-game-hack In PDF document text
    • https://www.ruchya.com.tw/upload/files/offers-to-complete-and-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-likes-on-tiktok-no-verification_GM835599320.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-to-hack-someones-minecraft-account_GM479516143.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/hack-roblox-cbro-download_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/tiktok-views-free_GM835599320.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/roblox-robux-hack-2021-ios_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-robux-downlaod-trackid-sp006_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-to-hack-people-on-roblox-without-downloads_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-catalogs-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-to-change-your-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-mod-apk-free-download-for-android_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-spins-for-coin-master-that-work_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-to-use-wurst_GM479516143.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_off00002d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D42 22204 bytes
SHA-256: 05c61423a8b839755ec281670ee8c53edec69e96567eaac7e2b2a1a34a7fc23e
font_01_sfnt_off00005e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E49 19064 bytes
SHA-256: e83e6ec4c124ed2d7ca7106d3550dd0cc1129fb3ff046dea9d423b5a0bd21ead

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