Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d96a5b7007c784…

MALICIOUS

PDF

33.6 KB Created: 2021-06-30 10:31:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f28b55418c96234385e17caf32b8bd7c SHA-1: 6d9e8a7a8ec19e997fe8cd5fb38b131433f71fc9 SHA-256: 19d96a5b7007c78419129cd29f5fef597371c2568615d7d7654c6b208f773bcf
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'free generators' and 'game hacks' for popular games like Roblox. The primary lure URL is http://netcdn.co/app/431946152/roblox-free-packages-download-game-hack, which is designed to entice users into clicking through to potentially malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/roblox-free-packages-download-game-hack In PDF document text
    • https://foc.vn/public/upload/files/robux-match_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • https://foc.vn/public/upload/files/cheats-for-royale-high-school-on-roblox_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-free-generator_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-rare-roblox-account_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/how-to-get-free-admin-in-roblox_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • https://foc.vn/public/upload/files/roblox-athoi-admin-hack-2021_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/roblox-all-free-items-2021-userscript_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/coin-master-35-2-hack_GM406889139.pdfIn PDF document text
    • https://foc.vn/public/upload/files/nero-cheat-codes-roblox-audio_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-tiktok-followers-without-verification_GM835599320.pdfIn PDF document text
    • https://foc.vn/public/upload/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://foc.vn/public/upload/files/free-robux-hack_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
stream_001_off00002a1b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2A1B 22796 bytes
SHA-256: 7c20f765912500e18de268ffa83892398393c4e30d97979d637fdf796835944a
font_01_sfnt_off00005d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D2D 19480 bytes
SHA-256: 39e67801a0de21b7bba2333ae9447ae45e2e23d67851eee46becf58df949184d