Malicious PDF — malware analysis report

Static analysis result for SHA-256 731fc73f16dd8321…

MALICIOUS

PDF

45.2 KB Created: 2021-06-07 18:23:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 771cbfb86cada5ca62069818d5cf1d29 SHA-1: 6b80a85b1bc5f51c04ccc998761a0a60ec413c7d SHA-256: 731fc73f16dd8321d77a9244dd80ca38dbf319c7c905c8e267135e5f716452ae
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, masquerading as 'game hacks' and 'free generators'. The primary lure URL is https://netcdn.tw/app/431946152/real-working-robux-hack-game-hack, which is associated with a critical heuristic firing for malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and heuristics suggest an attempt to redirect the user to potentially malicious content, likely for phishing or malware distribution.

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/real-working-robux-hack-game-hack In PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-get-free-pets-in-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-cheat-apk-free-download_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/cheats-coin-master-free-spins-and-news_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-demon_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-guide-to-free-spins-and-rewards_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/www-coin-master_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-roebucks_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-website-no-survey_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/master-game_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-just-click_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/pokemon-go-free-online-game_GM1094591345.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/hack-minecraft_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-and-spin-link_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-no-verification-or-survey_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
stream_004_off000051f5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51F5 26028 bytes
SHA-256: 7640f3114a3e4392cc7c9dfab1d5fed2c62ca17f292f32b62bacd1cef66c4aa8
font_01_sfnt_off00008c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C48 18928 bytes
SHA-256: 5debbc6b1c96faec722322d4ab2af2cf5a309676de6d94c48dc7f0bf11157169

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