Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad838d8c5d10c80…

MALICIOUS

PDF

44.9 KB Created: 2021-06-07 07:07:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e811292c5edb34dc0e0598783c780345 SHA-1: 8b2eeb95287f252b8841c0fc3a7f5620e611cd7a SHA-256: 8ad838d8c5d10c80f5c1fed1e3a3c9b55ddb807b68e86cd1cc0d4087c06b1c44
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically promoting a "free generator / game hack". The document body and extracted URLs reinforce this lure, aiming to trick users into visiting potentially harmful sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/unlimited-robux-hack-apk-game-hack In PDF document text
    • http://brinicombe.co.uk/images/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/fbchampion_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/free-roblox-clothes-2021_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/how-to-earn-free-stars-on-coin-master_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/free-tiktok-likes-app_GM835599320.pdfIn PDF document text
    • http://brinicombe.co.uk/images/roblox-hacks-for-mac_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/free-modded-minecraft-server_GM479516143.pdfIn PDF document text
    • http://brinicombe.co.uk/images/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/sb-game-hacker-coin-master_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/minecraft-java-edition-free-download-for-android_GM479516143.pdfIn PDF document text
    • http://brinicombe.co.uk/images/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://brinicombe.co.uk/images/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://brinicombe.co.uk/images/coin-master-levels_GM406889139.pdfIn PDF document text
    • http://brinicombe.co.uk/images/coin-master-spin-free_GM406889139.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
stream_004_off00004d30.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D30 26556 bytes
SHA-256: b8913dea69a73bb01a1ce6455efd9d362341c99c0ac3027b2cbc163c2416521f
font_01_sfnt_off000089e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89E2 19340 bytes
SHA-256: aa3057cbf753644dfad213d48b01b32c85dbdbec3d3b029b3e1016918dfbecd9

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