Malicious PDF — malware analysis report

Static analysis result for SHA-256 16511a81bd4f0995…

MALICIOUS

PDF

27.6 KB Created: 2021-06-26 08:29:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 145cf617e2c3973c67a875adab61a859 SHA-1: 1be1b75924a25bbf523927d6469d700d367b9633 SHA-256: 16511a81bd4f09953bf4e583e9b3b22195ec97f6f08a41ca3dfb5cd115e915cd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that are identified as malicious redirectors, specifically targeting users with lures for free in-game currency and hacks. The primary malicious URL identified is http://netcdn.co/app/431946152/free-robux-no-human-verification-2021-no-download-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to direct users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 3

  • 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.
  • 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/free-robux-no-human-verification-2021-no-download-game-hack In PDF document text
    • http://perpustakaan-stikesmsb.com/repository/clients-minecraft_GM479516143.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-clothes-roblox-group_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/mc-update_GM479516143.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-roblox-clothes-girl_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-spins-for-coin-master-that-work_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/roblox-games-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/tiktok-free-gift_GM835599320.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/racist-penguin-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/roblox-when-will-world-zero-release-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/coin-master-free-spins-link-2021-april_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/epic-turtle-plays-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/robux-website-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31EB 23152 bytes
SHA-256: 2a70bebdfe02a74cefcafc061a4069ab20b06f2fc118673aa5caddf238c4bc60

Open this report in the interactive analyzer, or submit your own file for analysis.