Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a28618a7e0c2a5…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 11:43:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4be4d009bc130be9574c09d4cf9e8ea3 SHA-1: edb55f38dfb00a9197d6c686a0861ca08c947276 SHA-256: 64a28618a7e0c2a568bd660a5d9efba9df14138d769428b0d0f28f9604490b70
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirector infrastructure, specifically advertising free Robux and game hacks. The document body and embedded URLs strongly suggest a lure for users to click through to potentially malicious websites. While no scripts were explicitly extracted, the nature of the links and the lure indicate a high likelihood of 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/free-robux-instantly-game-hack In PDF document text
    • http://studio-dentistico-fiume.com/files/how-to-get-sea-star-for-free-roblox_GM431946152.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/hack-for-rpg-world-on-roblox-to-get-money_GM431946152.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/coin-master-200-spin-link_GM406889139.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/daily-coin-master-free-spin-apk_GM406889139.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/coin-master-free_GM406889139.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/minecraft-pe-free-download-ios_GM479516143.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/coinmaster-spins_GM406889139.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/free-robux-codes-pastebin_GM431946152.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/ccv5-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/how-to-make-hack-scripts-for-roblox_GM431946152.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/rolbox-hacks-for-robux_GM431946152.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/get-minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/free-tiktok-followers-and-likes_GM835599320.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_off000031c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C8 22168 bytes
SHA-256: b0b6d3128969952c45c02beb3d7a30905c9732beb4f3c3fd805db432272d79a6
font_01_sfnt_off00006332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6332 19072 bytes
SHA-256: 2ca9d11195de567abf4a703037006073732e9aee935d3c5754ca148439903055

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