Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4a4f008d9e1338…

MALICIOUS

PDF

34.7 KB Created: 2021-07-07 03:02:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: cd3ab6ba6636855427724deab676c6dc SHA-1: 6a9bfeb443e17c0674ff48fe64941b0c759c44b4 SHA-256: ad4a4f008d9e1338dfd42022ba3850190315c54ff9388344c56abd98e31b9673
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which are SEO-optimized and point to files related to game cheats and hacks. The primary URL http://netcdn.tw/app/431946152/robuxfree-con-game-hack suggests a download lure for game-related exploits. The ML classifier also strongly indicated maliciousness, supporting the assessment of a phishing or malware distribution attempt.

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/robuxfree-con-game-hack
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/roblox-hackrar-2021_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-magical-chest-coin-master_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/coin-master-free-spins-gratis_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/minecraft-bedrock-for-free_GM479516143.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-robux-no-human-verification-no-survey-not-clickbait_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/hacker-news-roblox_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-robux-only-code-hack_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-robux-no-hack-robuxian_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/best-free-minecraft-server-hosting_GM479516143.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/coin-master-free-gift-links-2021_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-clothes-for-roblox-app_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/computer-roblox-hacking-apps_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/roblox-hacking-website_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/whats-robux_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/get-me-free-robux_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/how-to-get-free-pet-snacks-in-coin-master_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-spin-app-coin-master_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/roblox-cheat-engine-infinite-health_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/face-added-by-hacker-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000321b.bin
eeaadcbf3f80fb57f96bd11198241fdf54e2ca4a15e3b9b7dc200b20db061253		 pdf-font-stream PDF embedded font (sfnt) at offset 0x321B 22404 bytes
font_01_sfnt_off00006435.bin
07f4ceef81295c64281aed857bd22deb8ed60983d578a01bf899a81815814d41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6435 18552 bytes

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