Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24ce9750c55f438…

MALICIOUS

PDF

35.0 KB Created: 2021-07-03 21:59:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c339f63c31ecd28c6506e826f73dce19 SHA-1: 0672214646820557465d87bfefff8758311b37b3 SHA-256: d24ce9750c55f43895e41b036d166e0e784bd402a936dceed245ae63437cf7d1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links and text referencing 'free Robux' and 'game hacks', directly luring the user to click. The primary link, http://netcdn.tw/app/431946152/make-free-robux-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack aimed at directing users to potentially malicious websites for further exploitation.

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/make-free-robux-game-hack In PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/roblox-genuine-hack_GM431946152.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/how-to-put-in-hack-on-any-roblox-game_GM431946152.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/roblox-best-free-t-shirts_GM431946152.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/hacker-roblox-picture_GM431946152.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/apps-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/script-executor-roblox-free_GM431946152.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/how-to-add-cheats-to-a-roblox-game_GM431946152.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/i-want-free-robux_GM431946152.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/install-roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/free-robux-generator-not-human-verixication_GM431946152.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/best-site-for-free-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/pubg-uc-quiz_GM1330123889.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/get-free-robux-now-without-human-verification_GM431946152.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/how-to-get-free-roblox-gear-2021_GM431946152.pdfIn PDF document text
    • https://nutrafeliz.cl/ckfinder/userfiles/files/coin-master-free-gold-cards-link_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_off00003122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3122 22580 bytes
SHA-256: f36f78be390cd0f3d265788d1310535f46544d6bfa85b31d54f6ac75dd707bd9
font_01_sfnt_off000063d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63D0 19084 bytes
SHA-256: 480c89487a14742f7141225872d5c58d3fe4f75b5aa5747387f60334adf20675

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