Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c84ef83ecdbafe6…

MALICIOUS

PDF

47.2 KB Created: 2021-06-07 13:28:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 23de7dfb137a42492a0281d2725a8a5f SHA-1: e6657ce00559ccac3b0db3e12fae91e875d23034 SHA-256: 4c84ef83ecdbafe6aba9c69e983b423ad4a9e2e8dc826b7770ae788f1285a9c6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux' and game hacks. The primary lure URL is https://netcdn.tw/app/431946152/free-robux-with-cheat-engine-game-hack, which is flagged as a malicious redirector. The document body and embedded links strongly suggest a phishing or scam attempt to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/free-robux-with-cheat-engine-game-hack In PDF document text
    • http://berntfoto.dk/images/roblox-gang-rape_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/how-to-play-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://berntfoto.dk/images/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/free-roblox-executor-no-key_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://berntfoto.dk/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
    • http://berntfoto.dk/images/robuxmatchcon_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/coin-master-email-rewards-link_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/daily-free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/how-to-get-free-robux-without-buying-anything_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/roblox-profile-picture-free-to-use_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5072 24608 bytes
SHA-256: a9416c78225cfe12ff0779088399d926bb712ce4d57b69b808e0393a50778b77
font_01_sfnt_off00008956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8956 2844 bytes
SHA-256: a66b570a908761b39e6d9e18bcb667c353840a86c6a7db528f79d01abe6b23a1
font_02_sfnt_off000092fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92FD 19116 bytes
SHA-256: dc6d861335a7c37b74bb26898481a27a1b1e64ec71db653410a275c9cfed10be

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