Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d3162f6536e89c…

MALICIOUS

PDF

35.1 KB Created: 2021-06-23 17:15:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 65b914c6e121dabcc6ab9f07f2940b15 SHA-1: f8783a8c64b5f21c358b48b55dbd3366e980b8fe SHA-256: 93d3162f6536e89c4428f411b648f8d03ccd9d7bce13b1eec9a41988e7e8b821
102 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF links, suggesting a link farm. The document body and extracted URLs promote 'free Robux' and game hacks, indicating a lure for users to download potentially malicious files. The ML classifier also flagged this PDF as malicious with high confidence.

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.co/app/431946152/free-robux-2021-android-game-hack
    • https://citramandiribor.com/ckfinder/userfiles/files/roblox-account-hacke_GM431946152.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/coin-master-hack-apk-july-2021_GM406889139.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/hacks-to-get-free-robux_GM431946152.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/coin-master-free-link-blogspot_GM406889139.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/coin-master-freebies-2021_GM406889139.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/how-to-hack-and-get-free-robux_GM431946152.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/how-to-earn-free-spin-in-coin-master_GM406889139.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/coin-master-hack-apk-july-29_GM406889139.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/who-to-get-free-robux_GM431946152.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/best-free-spins-link-coin-master_GM406889139.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/earn-robux-today_GM431946152.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/coin-master-hack-ios-no-human-verification_GM406889139.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/free-pet-snacks-coin-master_GM406889139.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/free-minecraft-hosting-24-7_GM479516143.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/survey-tool-free-robux_GM431946152.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/coin-master-daily-free-spins-link-app_GM406889139.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/village-3-coin-master_GM406889139.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/best-free-minecraft-server-hosting-reddit_GM479516143.pdf
    • https://citramandiribor.com/ckfinder/userfiles/files/coin-master-bonus_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f4d.bin
0254a1c5db20c37469b39bbb948891ddd65352abfd89daed8deca487a5c6bc3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x2F4D 22928 bytes
font_01_sfnt_off0000630e.bin
7138cd98b12e9cc2154ff7676ac9a39bc8d22c3f1b16a9537d3a83282624220b
pdf-font-stream PDF embedded font (sfnt) at offset 0x630E 19412 bytes