Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66d6529568b7449…

MALICIOUS

PDF

35.2 KB Created: 2021-06-30 00:33:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2cc705b1f5acf5e07c016bc848f0c873 SHA-1: 38d6f79664532100418615551fc1948874d3096a SHA-256: c66d6529568b74493523c88a542ee1fa4619e78595cefc22acc4037cfdbee4dd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, disguised as a lure for free game currency and hacks. The document body explicitly mentions 'Free Robux Obby Limited Time Only' and includes the malicious URL, indicating a phishing or scam attempt. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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-obby-limited-time-only-game-hack In PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-easy-robux-hack_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coun-master_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-ninja-assassin-cheat_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-home_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-get-free-shirts-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/june-29-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/app-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-get-anything-for-free-roblox_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-get-clothes-for-free-roblox_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/hack-bloxtube-dinero-infinito-roblox_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/minecraft-pe-server-hosting-free_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-website_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-free-spins-and-coins-without-human-verification_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-free-spin-link-today-16-11-2021_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-apk-hack-358_GM406889139.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_off00003169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3169 22252 bytes
SHA-256: c8ee609f87b654677e5740061223d0be20c9d1a487010155b3802b141ab1af54
font_01_sfnt_off000062b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62B4 19628 bytes
SHA-256: 0e0b9a8bccf1f9bc3d5b1354ef5efc9e84a27f559bafd2163987f57d1d66e817

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