Malicious PDF — malware analysis report

Static analysis result for SHA-256 51290af79fa9eabb…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 06:01:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7f373b7c68afb1c0e1e964dde8dc2516 SHA-1: 92a5426cae573e247ccba0c78fb9039010d1fcd3 SHA-256: 51290af79fa9eabb21a0834741c12285bc77014b035da84a839a80c5ba31791e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links to external websites, identified by the PDF_SEO_LINK_FARM heuristic, which are likely part of a link farm or phishing scheme. The ML_NYX_PDF_MALICIOUS classifier also flagged the document with high confidence. The embedded URLs and the document body suggest a lure related to free game items or cheats, indicating a potential attempt to distribute malware or phish for credentials.

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/is-minecraft-java-edition-free-game-hack
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-vip-server-for-roblox-egg-hunt_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/daily-coin-master-free-link_GM406889139.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-robux-real-2021_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-spins-on-coin-master-without-human-verification_GM406889139.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/comment-avoir-un-mode-de-cheat-sur-roblox_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-spin-hack-coin-master-2021_GM406889139.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/roblox-phantom-forces-mod-free-weapons_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/codes-to-get-free-robux_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/is-minecraft-java-edition-free_GM479516143.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/how-do-u-get-robux_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-phone-no-human-verification_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/youtube-roblox-broken-bones-cheat_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-minecraft-server-hosting-with-plugins_GM479516143.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-printable-roblox-valentines_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/minecraft-pe-hack-client_GM479516143.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/how-do-u-hack-into-bases-on-sharpshooter-roblox_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/play-minecraft-free-online-no-download_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003386.bin
43bb7670e6b595c9510e13279d42d32761ac5d248ab095866964612e6d45aef3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3386 22156 bytes
font_01_sfnt_off0000644e.bin
31a4a06d9fb355d17720bdbd4e924d787a36c109291985566279346bb5d94ffc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x644E 18452 bytes

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