Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bdca75d14565699…

MALICIOUS

PDF

45.1 KB Created: 2021-06-10 13:45:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: de2b01626d40cf543774b57e99b64822 SHA-1: 6d7ca398b1d86d7d1b693948a7771efb37a3df7f SHA-256: 8bdca75d14565699f02073d627f22dc7f6b8e8ea37318796cba4f8d14ee5f9d3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically promoting 'game hacks' and 'free generators' to lure victims. The primary malicious URL identified is https://netcdn.tw/app/431946152/roblox-flood-escape-fly-hack-unpachible-game-hack. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classification strongly indicate malicious intent, likely to lead users to a compromised site or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/roblox-flood-escape-fly-hack-unpachible-game-hack In PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/coin-master-village-3_GM406889139.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/free-robux-accounts_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/can-you-still-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/coin-master-daily-free-spins-blog_GM406889139.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/killing-simulator-roblox-no-cheat_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/2021-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/free-robux-reddit_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/coin-master-cards-hack_GM406889139.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/download-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/instant-robux_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/is-minecraft-free-on-computer_GM479516143.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/coin-master-card-hack_GM406889139.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FB9 25464 bytes
SHA-256: 5c3191eb4ced64be350fb98c4e501e38ad309b12c49a719cc276d7a774f3151f
font_01_sfnt_off00008ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD0 19348 bytes
SHA-256: bf2e834c3cf1205e8fe6c7c094d2cd7b580584707c47450891b8562d0731ca01

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