Malicious PDF — malware analysis report

Static analysis result for SHA-256 338fff8d43a2f76b…

MALICIOUS

PDF

43.5 KB Created: 2021-05-17 14:11:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3e37df0447161e1ce0310dbe356b30cb SHA-1: 92bd7a2b5a8bb8caf73f89c7886b88be9bee4897 SHA-256: 338fff8d43a2f76b7046d4717ca4afe0b88aa0f00f0056fc37081ae0c8396679
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified as a link farm, directing users to external sites offering 'free spins' or 'Robux'. The ML classifier strongly indicates maliciousness, and the presence of a download button lure reinforces the deceptive nature of the document. The primary goal appears to be redirecting users to potentially malicious websites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 4

  • 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.
  • 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 https://netcdn.xyz/app/406889139/coin-master-admin-free-spins-game-hack PDF link annotation
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-free-100-spin_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-free-spins-fb_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-roblox-toys_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/do-coin-master-hacks-work_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-game-hack-version-download_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/minecraft-for-laptop-free_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-100-spin-slot_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-minecraft-windows-10-with-java_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-hack-online-generator_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
stream_003_off00004e0f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E0F 25796 bytes
SHA-256: 26573cdd8f6a7c0aa1b354816d85ac31209354ebde08966a3968dfbae29af13d
font_01_sfnt_off000087ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87EE 18320 bytes
SHA-256: 356ab8ba446e161f2af7577b22894ec36e2736224799e1ddbdd808f48a6a9d7e

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