Malicious PDF — malware analysis report

Static analysis result for SHA-256 c915cbaf40ea6444…

MALICIOUS

PDF

34.9 KB Created: 2021-07-07 08:22:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e1c1410185989e7dc331a818930670d9 SHA-1: a1095c795a85207fad838918d1949e9eecc5e8f0 SHA-256: c915cbaf40ea64444fa115810d97e99f7fb02efc1b9bc22ce7d11d49e3839419
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a prominent call-to-action in its body text, directing users to websites that promise free game currency or hacks. The ML classifier and PDF link farm heuristics strongly indicate malicious intent, likely to deliver a second-stage payload or phish for credentials. The primary URL http://netcdn.tw/app/431946152/change-you-roblox-name-for-free-game-hack is a key indicator of this lure.

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/change-you-roblox-name-for-free-game-hack
    • https://www.smarthealthme.com/uploaded_files/userfiles/files/coin-master-mod-apk-latest-version-free-download_GM406889139.pdf
    • https://www.smarthealthme.com/uploaded_files/userfiles/files/how-you-get-free-robux_GM431946152.pdf
    • https://www.smarthealthme.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-ipad-2021_GM431946152.pdf
    • https://www.smarthealthme.com/uploaded_files/userfiles/files/free-robux-2021-no-hacks_GM431946152.pdf
    • https://www.smarthealthme.com/uploaded_files/userfiles/files/how-to-hack-roblox-to-get-robux_GM431946152.pdf
    • https://www.smarthealthme.com/uploaded_files/userfiles/files/bunbun-girl-roblox-hacker_GM431946152.pdf
    • https://www.smarthealthme.com/uploaded_files/userfiles/files/roblox-hack-tool-no-survey-no-download_GM431946152.pdf
    • https://www.smarthealthme.com/uploaded_files/userfiles/files/no-scam-free-robux_GM431946152.pdf
    • https://www.smarthealthme.com/uploaded_files/userfiles/files/roblox-free-robux-com_GM431946152.pdf
    • https://www.smarthealthme.com/uploaded_files/userfiles/files/roblox-hack-ga_GM431946152.pdf
    • https://www.smarthealthme.com/uploaded_files/userfiles/files/hack-roblox-block-piece_GM431946152.pdf
    • https://www.smarthealthme.com/uploaded_files/userfiles/files/free-robux-real_GM431946152.pdf
    • https://www.smarthealthme.com/uploaded_files/userfiles/files/hack-tool-roblox-lumber-tycoon-2_GM431946152.pdf
    • https://www.smarthealthme.com/uploaded_files/userfiles/files/cherry-how-to-get-free-robux_GM431946152.pdf
    • https://www.smarthealthme.com/uploaded_files/userfiles/files/hack-tener-muchos-diamantes-en-royale-high-roblox_GM431946152.pdf
    • https://www.smarthealthme.com/uploaded_files/userfiles/files/how-many-levels-in-coin-master_GM406889139.pdf
    • https://www.smarthealthme.com/uploaded_files/userfiles/files/is-minecraft-education-edition-free_GM479516143.pdf
    • https://www.smarthealthme.com/uploaded_files/userfiles/files/free-card-link-coin-master_GM406889139.pdf
    • https://www.smarthealthme.com/uploaded_files/userfiles/files/youtube-roblox-lumber-tycoon-hack-cheat-engine_GM431946152.pdf
    • https://www.smarthealthme.com/uploaded_files/userfiles/files/how-to-make-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000313d.bin
bfc51717aef283a5277b37759be23577421f1c8c1ce52051255887b09cda9f35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x313D 22376 bytes
font_01_sfnt_off000062c7.bin
77f744a4f282f52abe2a9b304a362bb70117ab727e5f423179398c36dec7452f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C7 19380 bytes

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