Malicious PDF — malware analysis report

Static analysis result for SHA-256 63277c92c63cbec6…

MALICIOUS

PDF

36.7 KB Created: 2021-07-09 01:56:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8a4d79e202837e602d1292d5637d8bf2 SHA-1: b7618893bc66be16cd5bafd61f1f0f90d77a1112 SHA-256: 63277c92c63cbec664d0d897475ad2d57bc4efe14df72cc8abb9cf90306e0da2
102 Risk Score

Malware Insights

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

This PDF document contains multiple embedded links and a 'download button' lure, all directing users to pages offering 'free Robux' or similar game-related scams. The PDF is structured as a link farm, with 28 external links pointing to other scam-related PDFs, indicating a coordinated effort to redirect users to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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/431946152/free-robux-without-human-verification-2021-game-hack
    • https://lms.mabbaca.com/__statics/gudangsoal/files/how-to-get-free-roebucks-on-roblox_GM431946152.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/coin-master-daily-free-spin-app_GM406889139.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/coin-master-free-spins-hack-ios_GM406889139.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/how-to-get-a-free-minecraft-account_GM479516143.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/how-to-get-minecraft-pe-for-free_GM479516143.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/coin-master-daily-free-spins-link_GM406889139.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/actual-free-robux_GM431946152.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/free-robux-come_GM431946152.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/free-robux-group_GM431946152.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/best-site-for-free-coin-master_GM406889139.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/dominus-roblox-free_GM431946152.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/free-robux-websites-that-actually-work-2021_GM431946152.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/tiktok-free-movie-website_GM835599320.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/free-robux-hack-generator-no-verification_GM431946152.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/coin-master-free-spins-apple_GM406889139.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/how-to-get-free-robux-as-a-kid_GM431946152.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/coin-master-free-blogspot_GM406889139.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/roblox-rs16-5-hacks_GM431946152.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/do-coin-master-hacks-work_GM406889139.pdf
    • https://lms.mabbaca.com/__statics/gudangsoal/files/free-robux-microsoft_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003641.bin
53062c6ac3d7ea2563fdc0919f93a21ca6ad88d8555b060a89ebc1583fbc23b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x3641 22224 bytes
font_01_sfnt_off00006765.bin
224766b145fea2ee77d6018406834ac88e8b97acd6b6511a2b41135dc58ea70f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6765 20100 bytes