Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8d56b8e8e78134…

MALICIOUS

PDF

34.7 KB Created: 2021-07-01 06:46:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8c642e690f5389265c9b9a965a426882 SHA-1: e4d3cfa966809745ba4055fc7a43d91614359fdd SHA-256: 6b8d56b8e8e7813499d66f2e878101276074cae0cfe58eceb3d5037c847d36c3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free Robux' and 'game hacks' to lure victims. The primary redirector URL is http://netcdn.co/app/431946152/free-robux-with-proof-game-hack. While no scripts were explicitly extracted, the PDF structure and the nature of the links suggest it is designed to exploit user interest in gaming to deliver a malicious payload or lead to a phishing site. 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/free-robux-with-proof-game-hack In PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-hack-someones-ip-address-on-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/explode-hack-roblox-script_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-get-roblox-hack-for-free-guns-apocalypse-rizing_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-cheat-engine-table-download_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/2021-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-hack-known-gui-5_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-game-hack-tool-download_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/20-roblox-card-free_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-jailbreak-hack-2021-noclip_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-german-flag-t-shirt-free_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-get-free-robux-2021-videos_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-builders-club-roblox-2021_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/comment-cheat-sur-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-bloxburg-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/nonsense-diamond-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/cheats-robux-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/robux-hack-link_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-doumins-to-wear-out-of-game-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_off00002f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F49 22520 bytes
SHA-256: 5c2a63dce354ee956af18c8e58ed08c12e2ef3b3a02d369bc61e0f612c2e44d8
font_01_sfnt_off00006180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6180 19456 bytes
SHA-256: a65a487c2bdbd0a05ded5463e53608d850799ea6fbfb3be838dd1a99469c162c

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