Malicious PDF — malware analysis report

Static analysis result for SHA-256 dad4d6f39c343d71…

MALICIOUS

PDF

35.3 KB Created: 2021-06-19 20:35:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 03f92326ce593197050562d97b93df51 SHA-1: bcd5cb827c7a5640e0672fab591b89dac68a78f4 SHA-256: dad4d6f39c343d71f2fcee209c723045acf5fad63540d8762029475e87ec362f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to malicious redirectors, masquerading as free game hacks and Robux generators. These redirectors lead to further malicious PDF files, indicating a chain of malicious content delivery. The presence of these links and the lure of free items strongly suggest a phishing or scam campaign aimed at tricking users into downloading further malware or visiting compromised sites.

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-games-that-actually-work-2021-game-hack In PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-hack-spins-apk_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coin-master-hack-uk_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-free-attack_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coin-master-online_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/roblox-toy-codes-free_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-roblox-card_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/mcpe-download_GM479516143.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/https-rbx-place-rewards_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/minecraft-pe-017-0-apk-free-download-android_GM479516143.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/oprewards-com-earn_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coin-master-hack-no-verify_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/free-robux-games-that-actually-work-2021_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_off00002f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F15 22476 bytes
SHA-256: e95dda4907434771275d04a04e055481e87c4d80b94de04d814db43576bca4ae
font_01_sfnt_off0000617f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x617F 20272 bytes
SHA-256: 3dcbb05b4dce0a2bab4a10db55923dcb732eb0f4a2e9bcb9735c66d658b8cabb

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