Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23bcd1828687c98…

MALICIOUS

PDF

33.2 KB Created: 2021-07-19 08:20:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 930cb169249736ff295b0f8ec8f0e98c SHA-1: 78b3b867b0404723cd1d341ad14201f13d0107ba SHA-256: b23bcd1828687c98862419f82ea4ee3d29cc22eca0f600cf60febf3a8318963b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, masquerading as "free Robux generators" and "game hacks". The document body explicitly contains the URL http://netcdn.tw/app/431946152/free-robux-generator-for-kids-game-hack, which is flagged as a malicious redirector. The presence of multiple similar URLs suggests a phishing or scam campaign aiming to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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-generator-for-kids-game-hack In PDF document text
    • https://verstricktundzugenaeht.com/images/free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/robux-hack-me_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/minecraft-free-online_GM479516143.pdfIn PDF document text
    • https://verstricktundzugenaeht.com/images/how-to-get-free-robux-without-verifying_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_off00002b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B70 22560 bytes
SHA-256: 7c6c7ace72fd81e755560596d0c3c1c49214a0cd6636c0cadb44e396f7f15946
font_01_sfnt_off00005dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC7 18828 bytes
SHA-256: 4cbd0ae17372b8e997376decb208b799e75d96359c1fbbc6a9a72339bd757eb9

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