Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3abb0e83b40fc0e…

MALICIOUS

PDF

35.5 KB Created: 2021-07-03 17:15:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f548aabba893353ff357af89d140dbf9 SHA-1: cd0279cdbc9b18e3651312e37562c0a474398f10 SHA-256: f3abb0e83b40fc0e173a6c0bf0cd15936d020ba0073514207f3448f31ddb4a91
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs that lead to a known malicious redirector, disguised as a 'free generator / game hack'. The document body explicitly mentions 'Free Roblox Accounts With Robux 2021' and includes the malicious URL, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious.

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-roblox-accounts-with-robux-2021-game-hack In PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/coin-master-free-spins-and-coins-group_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/coin-master-free-link-blogspot_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/free-roblox-stricid-codes_GM431946152.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/coinmaster-hack_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/get-any-item-in-the-roblox-catolog-for-free_GM431946152.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/free-minecraft-codes-2021_GM479516143.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/piano-player-cheat-roblox_GM431946152.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/minecraft-free-android_GM479516143.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/free-robux-hack-generator-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/coin-master-hack-without-verification-for-iphone_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/where-is-the-free-apartments-in-mad-city-roblox_GM431946152.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/how-to-get-free-robux-no-download-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/get-free-robux_GM431946152.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/roblox-hack-game_GM431946152.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/grifffin-hat-gives-free-robux_GM431946152.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/coin-master-hack-september-2021_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/free-coin-master-spins-2021_GM406889139.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_off000031a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31A0 22344 bytes
SHA-256: 5a68165bb10a328594c113c883c30f35322951933417533156bbe8f55c60e7e2
font_01_sfnt_off0000636a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x636A 19780 bytes
SHA-256: 25192f6a53e08aa9ffc26a88a4bc642b185baba041384cccd6a0910bb22c1d67

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