Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f5c625dc736189…

MALICIOUS

PDF

35.1 KB Created: 2021-06-28 18:06:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 95b633a4eba72000d87ef22f7fff1831 SHA-1: bba0c17681c9a267045c0096eb528f4091a09425 SHA-256: 66f5c625dc736189f04821eb9df611188660dd69aff8fcf887a046aa8ed2bb0e
160 Risk Score

Malware Insights

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

The PDF document contains embedded links that lure users with promises of game hacks and free currency, directing them to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the document's structure suggests it's designed to exploit user interest in gaming to facilitate further malicious activity, likely through the redirector. No scripts were extracted, but the presence of malicious links and the lure indicate a phishing or social engineering attack.

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/how-to-hack-roblox-and-get-meep-city-coins-fast-game-hack In PDF document text
    • https://nature-air.com.tw/upload/files/free-robux-accounts-bugmenot-2021_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/gta-5-roblox-money-hack_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-avatar-girl_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-robux-wheel_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/robux_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-do-you-get-robux-hack_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-100-robux_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/arsenal-hacks-roblox_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-free-spin-app-apk_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-to-hack-games-in-roblox-on-ios_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-hack-unlimited-spins-and-coins-cheats_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/minecraft-windows-10-code-free_GM479516143.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/level-7-hack-roblox_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_off0000318d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x318D 21764 bytes
SHA-256: 2a3b03f4d716e2cce291d6877a86ab48fe227bb169f2f0402d0abe5d8db79baa
font_01_sfnt_off000061a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A0 19936 bytes
SHA-256: 413fc25491feb5d46b56626a71940068439131212ade45de69a0de04413d37c0

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