Malicious PDF — malware analysis report

Static analysis result for SHA-256 72936523f90618df…

MALICIOUS

PDF

34.4 KB Created: 2021-07-04 22:30:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2f66239935106512d3050158ba71d194 SHA-1: 78cc2bd54483ec06687edfa112b1a90c7aaf1bb0 SHA-256: 72936523f90618df49f2c3fc0a88cc4e27f7826f86a3e206e960900f01988282
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free Robux and game hacks to trick users into clicking malicious links. The document contains multiple embedded URLs that redirect to known malicious infrastructure, specifically designed to host scam pages. The primary malicious URL identified is http://netcdn.tw/app/431946152/claimrbx-free-robux-game-hack, which is associated with redirector activity. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or scamming attempt.

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/claimrbx-free-robux-game-hack In PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-flight-hack-download_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-hack-anybody-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-download-chip-windows-7-free_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-1x1x1x1-hack-crazy_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/eliot-ring-mig-roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-glitch_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/roblox-how-to-change-your-skin-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/is-there-a-free-version-of-minecraft_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/minecraft-free-education_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/how-to-cheat-in-roblox-welcome-to-farmland_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-free-spin-best-link_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-robux-images_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_off00003022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3022 22184 bytes
SHA-256: 12e1236116f7cb3f87bbfb0cba5501f2a5f970842c09d8ff585e7f80c60592e6
font_01_sfnt_off00006163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6163 19168 bytes
SHA-256: 7bf764ce28968fdb785bb336023e4079e63a9f6de2364164f85b44d41da13fd4

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