Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a7d87068aa8be4b…

MALICIOUS

PDF

35.1 KB Created: 2021-07-05 04:15:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4a5ebeac97756a1343ad336e7bd53e64 SHA-1: 492cc9cf1450a336f6e56b176f68cff9c7c71b4e SHA-256: 2a7d87068aa8be4bf6b4cdb20e64f8f0e0cbe3f615f75a0c5869e3234aa5d3b5
122 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to IP addresses, and uses SEO-like slugs in the URLs, suggesting a link farm designed to host malicious files. The document body and extracted URLs explicitly mention free redeem codes and hacks for popular games, indicating a social engineering lure. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to trick users into downloading harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/free-redeem-code-for-coin-master-game-hack
    • http://111.68.26.74/widyapustaka/repository/june-29-coin-master-hack-no-human-verification_GM406889139.pdf
    • http://111.68.26.74/widyapustaka/repository/get-free-robux-card-codes_GM431946152.pdf
    • http://111.68.26.74/widyapustaka/repository/boost9-com-roblox-hack_GM431946152.pdf
    • http://111.68.26.74/widyapustaka/repository/roblox-hack-apk-download-pc_GM431946152.pdf
    • http://111.68.26.74/widyapustaka/repository/roblox-hack-apk-download-2021_GM431946152.pdf
    • http://111.68.26.74/widyapustaka/repository/roblox-arsenal-aimbot-hack-download_GM431946152.pdf
    • http://111.68.26.74/widyapustaka/repository/free-robux-robuxking_GM431946152.pdf
    • http://111.68.26.74/widyapustaka/repository/pokemon-go-free-online-download_GM1094591345.pdf
    • http://111.68.26.74/widyapustaka/repository/minecraft-aimbot_GM479516143.pdf
    • http://111.68.26.74/widyapustaka/repository/roblox-hacks-online-no-download_GM431946152.pdf
    • http://111.68.26.74/widyapustaka/repository/this-obby-gives-you-free-robux_GM431946152.pdf
    • http://111.68.26.74/widyapustaka/repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdf
    • http://111.68.26.74/widyapustaka/repository/free-robux-no-download_GM431946152.pdf
    • http://111.68.26.74/widyapustaka/repository/roblox-robux-hack-free-robux-generator-uirbx-club_GM431946152.pdf
    • http://111.68.26.74/widyapustaka/repository/how-to-get-free-robux-zephplayz_GM431946152.pdf
    • http://111.68.26.74/widyapustaka/repository/how-to-get-free-tbc-on-roblox-2021_GM431946152.pdf
    • http://111.68.26.74/widyapustaka/repository/coin-master-heaven-daily-free-spins-and-coins-links_GM406889139.pdf
    • http://111.68.26.74/widyapustaka/repository/free-robux-not-a-scam_GM431946152.pdf
    • http://111.68.26.74/widyapustaka/repository/cheat-engine-64-free-download-roblox_GM431946152.pdf
    • http://111.68.26.74/widyapustaka/repository/free-spin-coin-master-link-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000032df.bin
2d44052c55e556b30efc8dbec7ac621f25375654c9bc765f9c06a4d411313fc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x32DF 22848 bytes
font_01_sfnt_off00006638.bin
c861c688303d0ce30a75b450dc2e1ce34b57c54574c870d49b8c2c1412c8bb94
pdf-font-stream PDF embedded font (sfnt) at offset 0x6638 18432 bytes