Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b4531fb02e4329…

MALICIOUS

PDF

34.6 KB Created: 2021-07-03 15:01:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4a3075e6fe73dcaf69e540f917c1bb11 SHA-1: 7ef4c53210dc74db480aec3383e6e3e429a77bad SHA-256: 83b4531fb02e4329993811d2d82ff6a7a007526140f2cc8f8c934795ff0239fe
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links and document body text that explicitly advertise 'free generator / game hack' lures, specifically mentioning Roblox and Robux. These links direct to a known malicious redirector infrastructure, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious.

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/roblox-mobile-hack-game-hack In PDF document text
    • http://perpustakaan.urindo.ac.id/repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/coin-master-hack-without-root_GM406889139.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/free-minecraft-java-edition-account_GM479516143.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/avatar-roblox-game_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/coin-master-heaven-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/hacked-accounts-of-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/roblox-hack-menu-download_GM431946152.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/free-roblox-vip-super-power-training-sim-servers_GM431946152.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/aristois-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/robux-free-co_GM431946152.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/roblox-mod-menu-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/pokemon-go-vs-free-fire_GM1094591345.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/free-roblox-account-giveaway-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.urindo.ac.id/repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.urindo.ac.id/repository/how-do-you-get-free-robux_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_off000030b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30B0 22332 bytes
SHA-256: b30a49902e21f5dc9473fb50153d735b572fd5e116c64ca7be09e773f8ad691c
font_01_sfnt_off00006262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6262 18972 bytes
SHA-256: 0e9155019685f09988e5274749080987783afe0cd242ca2fcc27e9f8310fa0e4

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