Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a01aaca2776248a…

MALICIOUS

PDF

35.1 KB Created: 2021-07-05 01:03:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1c9da2c6d8a2a699598d7b78676c29c5 SHA-1: 280968c691c5352e676c319d05761ff5d4ada2dc SHA-256: 4a01aaca2776248af381230fe398cd19c23f4931f9ef6cc445c17393c478f400
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, specifically http://netcdn.tw/app/406889139/free-coin-master-spins-daily-game-hack, which is presented as a lure for game hacks. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the embedded URLs and heuristic firings suggest a social engineering attack designed to lead the user to potentially harmful content.

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.tw/app/406889139/free-coin-master-spins-daily-game-hack In PDF document text
    • https://cleansui-home.com.tw/image/data/files/minecraft-free-demo_GM479516143.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/free-robux-apk_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/roblox-games-com-free_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/is-roblox-free-on-a-computer_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/life-hacks-for-robux_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/roblox-com-download-free_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/animation-free-roblox_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/how-to-hack-coin-master-android_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/can-you-change-your-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/get-robux-for-free-on-your-browser_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/how-to-hack-roblox-wls2_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/http-coin-master-hack-club_GM406889139.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://cleansui-home.com.tw/image/data/files/coin-master-free-spins-link-facebook_GM406889139.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_off000030f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30F7 23260 bytes
SHA-256: 7c53c8cb9c5d35de60cf4ae5ee00dcf49f82fee34c95ddc4afdef5b6274b070f
font_01_sfnt_off0000656e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x656E 18596 bytes
SHA-256: a7833972b885d34acb5ad01908fbd6133f193c29e2abbc4434009272e0e2ed6c

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