Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bcef2ae528af793…

MALICIOUS

PDF

34.0 KB Created: 2021-07-06 10:03:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: bb5cbdd80a5d4527b9ede870f7b34be7 SHA-1: 2e0c3cfe8db77652c8c792e1adf3045362029606 SHA-256: 6bcef2ae528af79313de8328d4727a2fcc1d9dd07fac18b8421d3d23933fde8f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a game hack redirector lure, directing users to a known malicious URL. The document body and embedded URLs reinforce this lure, aiming to trick users into visiting the malicious site. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

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/406889139/hack-coin-master-app-game-hack In PDF document text
    • http://winnerwater.com.tw/image/data/files/funny-free-roblox-avatars_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/2021-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/rbx-boots-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/roblox-hack-tools-no-virus_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/coin-master-free-spin-2912-2021_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/moonactive-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/booga-booga-roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/roblox-font-generator-free_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/roblox-bloxburg-free-money_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-spin-coin-master-hacktoman_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/free-roblox-toy-codes_GM431946152.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/coin-mast-hacks_GM406889139.pdfIn PDF document text
    • http://winnerwater.com.tw/image/data/files/how-to-get-minecraft-for-free-on-iphone_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
stream_002_off00002f5e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F5E 22816 bytes
SHA-256: e5661779da4e52bd3e84118baacb944a57dfd4f20fb2c277bf4a2df111e8fffd
font_01_sfnt_off00006285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6285 18180 bytes
SHA-256: ef8ccdc9f548d969a7b2ffa530b5dbe297edb5428ac09ad2e23710a4114dac37

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