Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d3802cea76da74…

MALICIOUS

PDF

55.3 KB Created: 2021-06-09 14:56:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ff78122fafef8eec4eaa01bde8ad501a SHA-1: 71e06ef803b546e1a1a849cb92eff585e0d7a4d2 SHA-256: 86d3802cea76da7425249f9dde29d78097531313ca90d7b5370d0fee0aa34b45
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and lures users with promises of game hacks and free items. The primary malicious link identified is https://netcdn.tw/app/431946152/roblox-hack-account-free-game-hack. Although no scripts were extracted, the document's structure and embedded URLs strongly indicate a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9671

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/roblox-hack-account-free-game-hack In PDF document text
    • https://www.croydex.com/uploads/files/files/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-free-skin_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-free-codes_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/roblox-images_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/minecraft-server-free-trial_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-roblox-accounts-dantdm_GM431946152.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-free-gold_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/coin-master-hack-2021-iphone_GM406889139.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/how-to-get-free-tiktok-fans_GM835599320.pdfIn PDF document text
    • https://www.croydex.com/uploads/files/files/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5342 25152 bytes
SHA-256: 9c9b845b4183ede9ea589acd28655e8801bbeef3205c2cfebfa71578e905d261
font_01_sfnt_off00008d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D4A 12800 bytes
SHA-256: db399d969d9309c9c38cb6e3c43aa83c06d227a5470715de93176d1df1e6747d
font_02_sfnt_off0000b527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB527 18588 bytes
SHA-256: 2386f1dcaa9a4c43086fea61c191fbe376a93311950162ddf5340c4879f911d0

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