Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f3c0f823e1baaf…

MALICIOUS

PDF

34.2 KB Created: 2021-07-03 20:06:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0ec6c0201d1078d344967ea7ecb6b96b SHA-1: 7b112b0864ced7db0f703e37f9f1aa80f46e3bb3 SHA-256: 43f3c0f823e1baaf1e1ccdd0718f07be117ed6d9d0649ab6f3e5637655357aa7
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites that promise free in-game items or currency, indicating a lure for users to download potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports a malicious intent. The document's content and structure suggest it is designed to trick users into clicking through to exploit 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/479516143/minecraft-story-mode-free-game-hack
    • https://www.takathmanduhotel.com/userfiles/files/hack-to-get-free-robux-on-ipad_GM431946152.pdf
    • https://www.takathmanduhotel.com/userfiles/files/hack-version-of-coin-master_GM406889139.pdf
    • https://www.takathmanduhotel.com/userfiles/files/free-coin_GM406889139.pdf
    • https://www.takathmanduhotel.com/userfiles/files/roblox-cheats-for-robux-android_GM431946152.pdf
    • https://www.takathmanduhotel.com/userfiles/files/coinmasterdailyfreespins-com_GM406889139.pdf
    • https://www.takathmanduhotel.com/userfiles/files/how-to-get-free-tiktok-followers_GM835599320.pdf
    • https://www.takathmanduhotel.com/userfiles/files/free-minecraft-severs_GM479516143.pdf
    • https://www.takathmanduhotel.com/userfiles/files/free-robux-no-human-verification-no-survey_GM431946152.pdf
    • https://www.takathmanduhotel.com/userfiles/files/uprobuxcom-free-robux_GM431946152.pdf
    • https://www.takathmanduhotel.com/userfiles/files/coin-master-daily-free-coins-link-today_GM406889139.pdf
    • https://www.takathmanduhotel.com/userfiles/files/pubg-uc-20_GM1330123889.pdf
    • https://www.takathmanduhotel.com/userfiles/files/coin-master-facebook-hack_GM406889139.pdf
    • https://www.takathmanduhotel.com/userfiles/files/tiktok-free-840-apk_GM835599320.pdf
    • https://www.takathmanduhotel.com/userfiles/files/coin-master-free-spins-link-2021-march_GM406889139.pdf
    • https://www.takathmanduhotel.com/userfiles/files/free-coin-link-for-coin-master_GM406889139.pdf
    • https://www.takathmanduhotel.com/userfiles/files/how-to-earn-robux-for-free-2021_GM431946152.pdf
    • https://www.takathmanduhotel.com/userfiles/files/free-robux-codes-2021-not-used_GM431946152.pdf
    • https://www.takathmanduhotel.com/userfiles/files/free-robux-without-downloading-apps_GM431946152.pdf
    • https://www.takathmanduhotel.com/userfiles/files/coin-master-free-daily-spins-and-coins_GM406889139.pdf
    • https://www.takathmanduhotel.com/userfiles/files/free-robux-generator-no-verification_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030ea.bin
e4c7b6c5bc1e3dd756acd839f8f27268322ab4d0f874791abb25921b33e48d2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x30EA 22404 bytes
font_01_sfnt_off000062b5.bin
75e49b2759fa984696c417d6c25ba92f7f0d6c06425984d3b958a192aa629ab4
pdf-font-stream PDF embedded font (sfnt) at offset 0x62B5 18352 bytes