Malicious PDF — malware analysis report

Static analysis result for SHA-256 78dedc3ef4c8ccc7…

MALICIOUS

PDF

45.5 KB Created: 2021-06-11 09:15:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a90b940387f4a5974dc62a00800b0476 SHA-1: d626b0d567485f8f02d72b4746824c726d3baf21 SHA-256: 78dedc3ef4c8ccc7efc983d2e7205f6ed706b4bf71e2e5cd784e26b88a107ec1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically promoting 'free Robux codes' and 'game hacks'. The document body and heuristics indicate a lure designed to trick users into visiting these malicious sites, likely to download further malware or engage in credential harvesting. No scripts were extracted, but the presence of malicious redirector links is a strong indicator of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/giving-away-free-robux-codes-game-hack In PDF document text
    • https://zosnow.com/wp-content/uploads/fsqm-files/f7-roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://zosnow.com/wp-content/uploads/fsqm-files/pastebin-roblox-items-free_GM431946152.pdfIn PDF document text
    • https://zosnow.com/wp-content/uploads/fsqm-files/cs-go-roblox-wall-hack_GM431946152.pdfIn PDF document text
    • https://zosnow.com/wp-content/uploads/fsqm-files/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • https://zosnow.com/wp-content/uploads/fsqm-files/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://zosnow.com/wp-content/uploads/fsqm-files/roblox-cheat-engine-fun-hacks_GM431946152.pdfIn PDF document text
    • https://zosnow.com/wp-content/uploads/fsqm-files/robux-hack-alan-walker_GM431946152.pdfIn PDF document text
    • https://zosnow.com/wp-content/uploads/fsqm-files/how-to-hack-songs-in-roblox_GM431946152.pdfIn PDF document text
    • https://zosnow.com/wp-content/uploads/fsqm-files/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • https://zosnow.com/wp-content/uploads/fsqm-files/roblox-hack-sahrbite_GM431946152.pdfIn PDF document text
    • https://zosnow.com/wp-content/uploads/fsqm-files/roblox-free-card-codes-december-2021_GM431946152.pdfIn PDF document text
    • https://zosnow.com/wp-content/uploads/fsqm-files/cheats-roblox-meep-city_GM431946152.pdfIn PDF document text
    • https://zosnow.com/wp-content/uploads/fsqm-files/free-glasses-for-roblox_GM431946152.pdfIn PDF document text
    • https://zosnow.com/wp-content/uploads/fsqm-files/roblox-free-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://zosnow.com/wp-content/uploads/fsqm-files/free-roblox-bots_GM431946152.pdfIn PDF document text
    • https://zosnow.com/wp-content/uploads/fsqm-files/genewin-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://zosnow.com/wp-content/uploads/fsqm-files/roblox-bloxburg-free-100k_GM431946152.pdfIn PDF document text
    • https://zosnow.com/wp-content/uploads/fsqm-files/roblox-wikipedia-free-encyclopedia_GM431946152.pdfIn PDF document text
    • https://zosnow.com/wp-content/uploads/fsqm-files/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • https://zosnow.com/wp-content/uploads/fsqm-files/free-military-shirt-template-for-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
stream_004_off00005219.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5219 25192 bytes
SHA-256: c856faaa50f5b7a7758100888d57ed1f57f0ab11380af44d87d30a163ed9f24e
font_01_sfnt_off00008c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C14 19284 bytes
SHA-256: a92c8030738d8483f2794c3bbca0bad5384b572d2c86dce74c121a1b4f7e459b

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