Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9b81286dd0d767…

MALICIOUS

PDF

45.1 KB Created: 2021-06-07 08:47:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 90f2daaf680ab9dd66caa47092eebb53 SHA-1: 6644da4b1d2bb84b88e18c352c1faea00abe4021 SHA-256: 3b9b81286dd0d7672de27a3434da9659c432f475f70c514944acf41a3c85548d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links to known malicious redirectors, specifically promoting game hacks and generators. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a social engineering lure designed to redirect users to potentially harmful websites or initiate further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/cch-hack-robux-2021-game-hack In PDF document text
    • http://repository.unla.ac.id/repository/red-boy-v2-jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/hack-coin-master-apk-32-download_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/can-you-give-me-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-master_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/pubg-uc-generator-no-verification_GM1330123889.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/minecraft-mojang-free_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/rbx-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/links-to-get-free-coins-in-coin-master_GM406889139.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000513b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x513B 25440 bytes
SHA-256: 22a6f71d2a18ddf467fa4e85e36ea6d4d540539d60985ae1dbca163769759c14
font_01_sfnt_off00008beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BEB 18816 bytes
SHA-256: 22222b69c73dc23eec7419a3c0af9395055434f6c96b0ebc33cf1bd3f92f3fb1

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