Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc662d360cd5c3f…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 09:06:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 74df4c7632b034e1f4280cb4e68bafda SHA-1: febf53ed52c890425985c89f359776f56c3f594d SHA-256: 9bc662d360cd5c3fb48f73c27d33a484177461c268fa4c8f2ae7469d0aa6d1a9
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to external files, a technique commonly used for SEO link farming and distributing malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of a download button lure further supports a malicious intent. The primary URL http://netcdn.tw/app/406889139/coin-master-daily-gifts-game-hack likely serves as the initial download point for a secondary payload.

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-daily-gifts-game-hack
    • https://morishita-tc.com.tw/image/data/files/hack-roblox-ipod_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/free-robux-on-pc_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-link-spin_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/new-hack-en-roblox_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/how-to-hack-roblox-accounts-on-computer_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-spins-hacktman_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/hey-google-how-do-you-get-free-robux_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/free-spins-coin-master-hack_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-hack-2021-android-apk_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-spins-2021-today_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/free-robux-codes-no-survey-2021-october_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/hacks-for-fallen-that-actually-work-roblox_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/give-me-robux-now_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/roblox-boga-boga-infinite-mojo-hack_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/free-robux-com-real_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-bonus_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/best-way-to-hack-coin-master_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/buxblast-com-robux_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-2021-spin-link_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/free-robux-no-verification-2021-android_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003093.bin
8ed0da5ec2d88d8015eee908033acabea3b60639a0ff0f2a1ba601270358fcc5
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3093 23288 bytes
font_01_sfnt_off000064e8.bin
9a57ad812e157e436bcc4047eb8b4adcab852283a97400467038476e1586e01e
pdf-font-stream PDF embedded font (sfnt) at offset 0x64E8 18256 bytes