Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64dacba533378cc…

MALICIOUS

PDF

33.9 KB Created: 2021-07-09 02:41:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1b4335576e97a20eaf1ec1e3550d81e7 SHA-1: 7e5e607698921149165fdef49ff857eb3ddbaf4a SHA-256: b64dacba533378ccbb492183560172f084bd87ba132509a829ddc6a372cf968e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of 'free Robux' or 'game hacks'. The embedded URLs, such as http://netcdn.tw/app/431946152/how-to-gift-robux-on-mobile-game-hack, are designed to lead users to potentially malicious websites. The ML classifier also strongly indicated maliciousness.

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/how-to-gift-robux-on-mobile-game-hack In PDF document text
    • https://wenshan.com.tw/upload/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/1-million-robux-hack_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/free-roblox-girls-outfit-codes_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/get-free-spins-link-in-coin-master_GM406889139.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/free-robux-scratch_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/how-to-get-free-tiktok-coins_GM835599320.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/how-to-use-cheat-engine-roblox_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/free-robux-2021-sans-verification_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/minecraft-mobile-free_GM479516143.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/como-descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/how-to-get-1-robux-free_GM431946152.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/minecraft-free-computer-game_GM479516143.pdfIn PDF document text
    • https://wenshan.com.tw/upload/files/serveur-discord-hack-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3098 21272 bytes
SHA-256: a6420144a9ea0a46df1b148966797aabaa78dd6855db877795bf6888b16fa581
font_01_sfnt_off00005efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFC 19212 bytes
SHA-256: bc5fdf2573ba02d8ebbd4383ba1ec7dafda423df0baa75127e805848098bb58d

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