Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5cbfa127a10a84…

MALICIOUS

PDF

45.7 KB Created: 2021-06-10 18:40:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0e2c202b195d3953bb4f214d391ddbf9 SHA-1: 77c20c14d5f82c0307e801f87387ae5a3c9c7001 SHA-256: cc5cbfa127a10a848e8cc0e2578691347e80f7c3a01ed60540a6b0d3b6775a23
102 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external PDF files, many of which appear to be SEO-driven content related to game hacks and free items. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a coordinated effort to drive traffic to potentially malicious content. The presence of a download button lure further supports the malicious intent of directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/hacker-game-in-roblox-game-hack
    • https://www.orbai.ai/uploaded_files/userfiles/files/free-back-accessories-roblox_GM431946152.pdf
    • https://www.orbai.ai/uploaded_files/userfiles/files/coin-master-hack-version-download-2021-android_GM406889139.pdf
    • https://www.orbai.ai/uploaded_files/userfiles/files/how-to-get-free-roebucks_GM431946152.pdf
    • https://www.orbai.ai/uploaded_files/userfiles/files/infinite-speed-roblox-hack_GM431946152.pdf
    • https://www.orbai.ai/uploaded_files/userfiles/files/is-roblox-free-on-nintendo-switch_GM431946152.pdf
    • https://www.orbai.ai/uploaded_files/userfiles/files/how-to-get-free-gamepasses-on-roblox_GM431946152.pdf
    • https://www.orbai.ai/uploaded_files/userfiles/files/how-to-get-free-coins-in-mcpe-master_GM406889139.pdf
    • https://www.orbai.ai/uploaded_files/userfiles/files/free-minecraft-bedrock-server-hosting_GM479516143.pdf
    • https://www.orbai.ai/uploaded_files/userfiles/files/roblox-generator_GM431946152.pdf
    • https://www.orbai.ai/uploaded_files/userfiles/files/free-minecraft-account-generator_GM479516143.pdf
    • https://www.orbai.ai/uploaded_files/userfiles/files/is-pubg-uc-worth-it_GM1330123889.pdf
    • https://www.orbai.ai/uploaded_files/userfiles/files/minecraft-pe-texture-packs-free-download_GM479516143.pdf
    • https://www.orbai.ai/uploaded_files/userfiles/files/what-do-points-do-in-roblox_GM431946152.pdf
    • https://www.orbai.ai/uploaded_files/userfiles/files/free-coin-master-spins-for-today_GM406889139.pdf
    • https://www.orbai.ai/uploaded_files/userfiles/files/tiktok-free-money_GM835599320.pdf
    • https://www.orbai.ai/uploaded_files/userfiles/files/how-to-get-free-robux-on-phone_GM431946152.pdf
    • https://www.orbai.ai/uploaded_files/userfiles/files/free-minecraft-alt-generator_GM479516143.pdf
    • https://www.orbai.ai/uploaded_files/userfiles/files/coin-master-hack-without-verification-code_GM406889139.pdf
    • https://www.orbai.ai/uploaded_files/userfiles/files/discord-free-account-roblox_GM431946152.pdf
    • https://www.orbai.ai/uploaded_files/userfiles/files/free-roblox-accounts-with-builders-club_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052ce.bin
f0340009f50a17099111ee784161483018bd70df6682e2372c58e3089e82fb3a
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52CE 26368 bytes
font_01_sfnt_off00008fac.bin
022a8daec9c33fdf65ffa151b30d0eab6f5d7fb872795189b4f005cf6cb66909
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FAC 18440 bytes