Malicious PDF — malware analysis report

Static analysis result for SHA-256 78670cd5c06a6cbe…

MALICIOUS

PDF

34.6 KB Created: 2021-07-08 21:06:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: fa34e880bb33ee872204003e76fc5721 SHA-1: 14f92f4fa4a59a87f762ce1e2a8714b72d21542f SHA-256: 78670cd5c06a6cbe7d7fa2f18afaab952d1f204d75c17f5037bc67dfe7639061
102 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are SEO-optimized PDFs related to free Robux and game hacks. The primary URL, http://netcdn.tw/app/431946152/uprobuxcom-free-robux-game-hack, suggests a download lure. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or distributing malware.

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/uprobuxcom-free-robux-game-hack
    • https://morishita-tc.com.tw/image/data/files/rbxfree-com-free-robux_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/can-you-actually-get-free-robux_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/comment-hacker-des-gens-sur-roblox_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/free-package-codes-roblox-2021-november-17_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/can-you-get-roblox-on-nintendo-switch-for-free_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-spins-daily-fb-champion_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-free-spins-april-2021_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/how-to-get-free-robux-instantly_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/free-spins-coin-master-hack_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/free-robux-gift-card-codes-2021_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-hack-without-verification-2021_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/minecraft-free-edition_GM479516143.pdf
    • https://morishita-tc.com.tw/image/data/files/hack-robux-2021_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/how-to-hack-into-someones-roblox-account_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/tiktok-free-bot_GM835599320.pdf
    • https://morishita-tc.com.tw/image/data/files/coin-master-hack-apk-2021_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/free-spin-link_GM406889139.pdf
    • https://morishita-tc.com.tw/image/data/files/robux-free-co_GM431946152.pdf
    • https://morishita-tc.com.tw/image/data/files/cheats-for-roblox-on-phone_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f6b.bin
8c6bd01d684aee902337877ce35df3fc133f69078df81110e8bce1fd7b5c02d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2F6B 22712 bytes
font_01_sfnt_off000061fd.bin
77e1d77af257f2799f450e4aedc0e1b3eb2c97b8c20e190c5e1e9f2e5b207ac7
pdf-font-stream PDF embedded font (sfnt) at offset 0x61FD 19152 bytes