Malicious PDF — malware analysis report

Static analysis result for SHA-256 6706ca8f3b635264…

MALICIOUS

PDF

34.7 KB Created: 2021-07-10 01:12:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5102fda034f4c1f62c908287f9ab7942 SHA-1: d886aa8f9a57bfcba5995843bf122f5b7b6f14d3 SHA-256: 6706ca8f3b6352649cb5bdb1e6d0be3c0d4e457752bc49d063daa44ee9322fba
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures for 'game hacks' and 'free generators'. The document body explicitly contains the URL http://netcdn.tw/app/431946152/how-to-get-free-robux-without-downloading-apps-game-hack, which is presented as a way to obtain free Robux without downloading applications. This suggests a phishing or malware distribution attempt.

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-get-free-robux-without-downloading-apps-game-hack In PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-unlimited-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-free-spin-and-coin-link-app_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/b-tool-hack-in-roblox-link_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/cheat-engine-la-roblox-para-hilesi-nasil-yapilirir_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/speed-hack-assassin-roblox_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/get-robux-com_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-minecraft-videos_GM479516143.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/gift-card-generator-hack-robux-codes_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-change-username-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/earn-free-robux_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/counter-blox-roblox-offensive-wall-hack_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/roblox-games-free_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-hack-cookie-clicker-roblox_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/how-to-get-free-obc-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/coin-master-links-for-free-spins_GM406889139.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • https://sunnygarden.com.tw/image/data/files/free-robux-without-offers_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_off00002ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ED6 22000 bytes
SHA-256: 96bfb52554f142552f11cdc1729b180d99d25ceb16417c2d675324e621c012d5
font_01_sfnt_off00005f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5F 20060 bytes
SHA-256: 44f0105255c4bb73f6c79bc6e5489dacf7eb081798d72a7dddb9830b56c75d42

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