Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b53e0e170594fc…

MALICIOUS

PDF

35.7 KB Created: 2021-07-08 00:18:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 41fd04a29cefd96f63f64f0e498d491c SHA-1: ae54e253081dcf176d76f2eb213d2003a4784e51 SHA-256: 90b53e0e170594fc8ee2ff8fe3e211e8ac4ec92b90f44fa066617fa1b0eafc45
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, identified as a link farm, that direct users to external websites offering game cheats and free in-game currency. The primary URL, http://netcdn.tw/app/406889139/coin-master-heaven-daily-free-spins-and-coins-links-game-hack, is presented as a lure for 'Coin Master' cheats. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used to distribute malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-heaven-daily-free-spins-and-coins-links-game-hack PDF link annotation
    • https://healthcare.kyst.com.tw/image/data/files/comment-hacks-roblox-skywars_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/farming-simulator-money-cheat-roblox_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-free-spins-link-facebook-page_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-pants-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-get-daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-do-you-make-tshirts-free-roblox_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-hack-into-peoples-account-in-roblox_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/comment-avoir-un-wall-hack-roblox_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-meepcity-free-plus_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/google-sites-roblox-hack-online_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-hack-robux-2021-subscribe_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-roblox-bandit-mask_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/toolbox-for-minecraft-pe-ios_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-get-free-robux-not-downloads_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-hack-apk-app_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_off00003354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3354 22976 bytes
SHA-256: 6f7e45dd8fea22446de777efa464ef6f966896c99f4e0679fa0130aab55d7980
font_01_sfnt_off000066bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66BF 19056 bytes
SHA-256: 803b08b6f06247c41f0de4833b75fa2b1ccb1155f19f5f0c28bf2f4e3a032072

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