Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f9fd38238fdefd1…

MALICIOUS

PDF

49.5 KB Created: 2021-06-04 03:22:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e98c28a049194966db6dee7ddf5ef40a SHA-1: e9492e91ab8b5d7f7fc88208a4c55f33224a8451 SHA-256: 3f9fd38238fdefd17e1cb97a2bcd53713f7cb18e37641c337269111f131412e2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, specifically targeting users interested in game hacks and free Robux. The document body, though partially corrupted, contains references to these lures and embedded URLs. The primary function appears to be redirecting users to potentially malicious websites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.online/app/431946152/roblox-promo-codes-for-free-robux-game-hack In PDF document text
    • http://perpus.i2s-learning.com/repository/collect-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/what-is-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-online-hack-no-survey-no-password_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/roblox-free-accessories_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/minecraft-for-laptop-free_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/coin-master-hack-pc-cheat-engine_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/robux-withdraw_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com//repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/coin-master-link_GM406889139.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://perpus.i2s-learning.com/repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000053ca.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53CA 28384 bytes
SHA-256: 016f315e7614153437f800c9fbf67b5515debf47845e3454674de96d6a8841cc
font_01_sfnt_off000093e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93E3 2880 bytes
SHA-256: 680cee9962ed9b8340f32eb4497b4a869b674082cb72c24c089fa73c4597fa7a
font_02_sfnt_off00009db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DB8 18676 bytes
SHA-256: 3ed324e585500d41944ebd93500991c566830021fec9c5a8323b790459c3443f

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