Malicious PDF — malware analysis report

Static analysis result for SHA-256 28210f9fd824f6d3…

MALICIOUS

PDF

36.3 KB Created: 2021-07-04 09:37:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e4998ce63e78f173e34feb105a175702 SHA-1: 96c922ad50ba378e5c3397920f85022d8b4ff77f SHA-256: 28210f9fd824f6d30ca7a9544dedc2c85c2b8da1d15876497a47a8a0206f1536
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on offers for free Robux or game hacks. One of the primary links, http://netcdn.tw/app/431946152/robux-free-robux-game-hack, is identified as a malicious redirector. The document's structure and embedded links suggest a phishing or scam attempt, likely intended to lead users to a compromised site or download further malware. No scripts were extracted from this sample.

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/robux-free-robux-game-hack In PDF document text
    • http://libsmpn1balongpo.sch.id/repository/free-robux-gift-cards-no-survey_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-minecraft-client_GM479516143.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/roblox-sued_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/i-succ-for-free-robux_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/roblox-generator-com_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-roblox-money_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/best-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/free-robux-no-kind-of-surveys_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/instantrobux_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/roblox-hack-robux-420_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/roblox-speed-hack-without-cheat-engine_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/get-free-robux-on-roblox-using-no-downloads_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/yt-roblox-free-roubux_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_off00003646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3646 23080 bytes
SHA-256: 828065f7b24d4d80c8a5609c05230165c53975b9b41a8a78223d3cd435bd121b
font_01_sfnt_off00006a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A10 18716 bytes
SHA-256: 776cb4e5338264d595c967a8fec9379201c9a4b17293b3c44edd5cf6cd499e31

Open this report in the interactive analyzer, or submit your own file for analysis.