Malicious PDF — malware analysis report

Static analysis result for SHA-256 0628f03fd9773d4f…

MALICIOUS

PDF

34.4 KB Created: 2021-07-02 06:55:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8c35d45484a39575e9f2f042b005e7d9 SHA-1: d530240a0a948ab14fca2fa1084c3a442b8743ed SHA-256: 0628f03fd9773d4f4b7fb7fc09f9416d764e9930f950b3e8149b76f4177a2409
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, disguised as free game hacks and Robux generators. The primary malicious URL identified is http://netcdn.co/app/431946152/boku-no-roblox-hack-quirk-vermillion-game-hack. This lure is designed to trick users into clicking through to potentially malicious websites or downloading further malware. The ML classifier also strongly indicated maliciousness.

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.co/app/431946152/boku-no-roblox-hack-quirk-vermillion-game-hack In PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-do-u-get-free-robux-on-roblox-on-ipad_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/roblox-does-free-follower-game-real_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-to-get-free-coins-on-dance-off-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/robux-hack-with-no-varication_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-robux-promo-codes-2021-works_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/how-do-you-make-a-shirt-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/roblox-insta-arrest-hack-jailbreak-pastespin_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/roblox-free-rthros_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/gift-robux-free_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-suit-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-download-roblox-tshirt-guns_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/roblox-robux-hack-apk-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/roblox-how-to-get-robux-hack-no-scam_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/roblox-download-free-pc-windows-xp_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.unitomo.ac.id/repository/xsos-hack-roblox_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_off00002f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F2E 22148 bytes
SHA-256: 4b68a8764455635b6269609004546a68c916cffff832f4c03f78c47d3cbd4792
font_01_sfnt_off00005fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEE 19468 bytes
SHA-256: a83461bfdae620b5898b5cdfa074da5a7c1c6a30e2f2c7e8e887ec82e75a5341

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