Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1518a6c19750257…

MALICIOUS

PDF

34.1 KB Created: 2021-07-05 06:16:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 69b3789fe87ca043bde9c1c27f36db9e SHA-1: 144de45b06683cbe52c57875b4c33a0144349162 SHA-256: a1518a6c197502576acbed577a47e77861bfb9a151b78b0a322a9324ddd1bd90
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded links that lead to a known malicious redirector infrastructure, specifically http://netcdn.tw/app/431946152/but-link-says-free-robux-game-hack. The document body and heuristics indicate a lure for free Robux or game hacks, a common social engineering tactic. The PDF likely serves as a delivery mechanism for further malicious content via the redirector.

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/but-link-says-free-robux-game-hack In PDF document text
    • https://library.um-sorong.ac.id/repository/for-free-robux-on-roblox-com-free4mobile24-com_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/oprewards-com-robux_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/roblox-hacker-face_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/bvb-kit-roblox-template-free_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-promo-code-roblox-robux_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/coin-master-online_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-robux-co_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/coin-master-hack-spins-apk-download_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/roblox-free-robux-online-no-survey_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/robuxhub-net_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/coin-master-unlimited-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/roblox-robux-hack-without-verification_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/roblox-game-for-windows-10-free-download_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-gift-cars-for-roblox_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/roblox-free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-shirts-suits-roblox_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_off0000302c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x302C 21636 bytes
SHA-256: 742f93bbf6707f402165847585c581f98ffb71a6ab91187d9804e5581ca25e93
font_01_sfnt_off00005f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F89 19292 bytes
SHA-256: 85e89077dd7519a4f4a641b8f2e0513bf80b3f407ef760b68c8b6f40ad995aa9

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