Malicious PDF — malware analysis report

Static analysis result for SHA-256 53bc0ea76ec734d9…

MALICIOUS

PDF

46.1 KB Created: 2021-06-09 14:51:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d9896a9845a8d7a25cfe5492afb0e924 SHA-1: ac56c4580637dcda8cc0aa80b29f64db30100b84 SHA-256: 53bc0ea76ec734d9be449b4778ba64b9575293059b6b573d0cee8966b4ba7291
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 'free generator' or 'game hack' content. The embedded URL, https://netcdn.tw/app/431946152/get-free-robux-no-survey-game-hack, is likely used to download a second-stage payload. The document's structure and content strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/get-free-robux-no-survey-game-hack In PDF document text
    • https://www.knjizara-harfa.rs/files/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-hack-spins-apk-download_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-coinmaster-spins_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-minecraft-generator_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/minecraft-free-minecraft_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/rewardrobux-com_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/easy-robux_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/rbxboost-get-free-robux-online_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-online-hack-generator_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-free-faces-on-roblox-2021_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_off000054c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54C1 26104 bytes
SHA-256: 1136bd162c0b689fba7e21fe7f5f35e9f1bb6dcd1ebd61ea3171d191d649a83b
font_01_sfnt_off00009151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9151 18412 bytes
SHA-256: b293147dad63080d3663023203b1ab7848744c56e4371f48b462ae5850b2fc99

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