Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd553d5850d7235…

MALICIOUS

PDF

33.3 KB Created: 2021-06-18 10:18:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 69e447acacecc35bb7ed984dbda2c75b SHA-1: b93a628cd974218b75b4cde80bfd1289b228fada SHA-256: abd553d5850d7235cafaa714a29429977f3a51e456e7c6cbc00489df996a61d2
142 Risk Score

Malware Insights

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

The PDF contains numerous links to websites offering 'free generators', 'game hacks', and 'robux', indicating a lure for users interested in such topics. The heuristic 'PDF_SEO_LINK_FARM' suggests this PDF is part of a link farm designed to attract traffic through search engines. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs further supports a malicious intent, likely to redirect users to scam or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/835599320/free-tiktok-fans-game-hack PDF link annotation
    • https://new-era.com.tw/image/data/files/free-minecraft-severs_GM479516143.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/coin-master-guide-to-free-spins-and-rewards_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/does-coin-master-hack-work_GM406889139.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/what-are-points-for-in-roblox_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/free-apk-mod-coin-master_GM406889139.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/free-coin-master-spins-no-verification_GM406889139.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/free-robux-scam_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/cmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/roblox-locus-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/robuxy-com-generator_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/mcpe-free-download_GM479516143.pdfIn PDF document text
    • https://new-era.com.tw/image/data/files/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/get-robux_GM431946152.pdfIn PDF document text
    • http://new-era.com.tw/image/data/files/how-to-make-free-robux_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
font_00_sfnt_off00002ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EA5 22260 bytes
SHA-256: 4581dbdd1d17af9e6662f92dad7930b3752c25607afc6dd94c5a1437f74ffe8b
font_01_sfnt_off00006023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6023 17972 bytes
SHA-256: 87f31bbce025ab7961c0308c6f930bfb3cd8ef09f5fe635d9ab670b851b9ee5c

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