Malicious PDF — malware analysis report

Static analysis result for SHA-256 f46bc2ca3eb15663…

MALICIOUS

PDF

46.5 KB Created: 2021-06-03 07:28:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c7c8660f8154bee0ea1c9d02c1aaeba2 SHA-1: 78f6ca3dfd763a92d11f1a20dbe2f9bfa29057a8 SHA-256: f46bc2ca3eb15663c064b352744d917e6a7847b3992c466ca0f1b0288d11c5b8
142 Risk Score

Malware Insights

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

The PDF document contains a lure for a game hack, directing users to download a file from a suspicious URL. It also features a large number of embedded links to other SEO-optimized PDF documents, likely to improve search engine ranking for malicious content. The ML classifier strongly indicated maliciousness, and the presence of external URI firings suggests the document is designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.online/app/479516143/minecraft-hack-2021-game-hack
    • https://www.wco.org.uk/uploads/files/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdf
    • https://www.wco.org.uk/uploads/files/files/coin-master-link_GM406889139.pdf
    • https://www.wco.org.uk/uploads/files/files/hacker-minecraft-song_GM479516143.pdf
    • https://www.wco.org.uk/uploads/files/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdf
    • https://www.wco.org.uk/uploads/files/files/how-to-get-free-robux-for-real_GM431946152.pdf
    • https://www.wco.org.uk/uploads/files/files/roblox-dominus-free_GM431946152.pdf
    • https://www.wco.org.uk/uploads/files/files/wurst-mc_GM479516143.pdf
    • https://www.wco.org.uk/uploads/files/files/how-to-get-free-robux-easy-hack_GM431946152.pdf
    • https://www.wco.org.uk/uploads/files/files/free-tiktok-followers-no-downloads_GM835599320.pdf
    • https://www.wco.org.uk/uploads/files/files/coin-master-hack-lost-world-2021-com_GM406889139.pdf
    • https://www.wco.org.uk/uploads/files/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdf
    • https://www.wco.org.uk/uploads/files/files/minecraft-bedrock-edition-free-with-java_GM479516143.pdf
    • https://www.wco.org.uk/uploads/files/files/how-to-duplicate-coin-master-spin-hack_GM406889139.pdf
    • https://www.wco.org.uk/uploads/files/files/tiktok-free-hearts-2021_GM835599320.pdf
    • https://www.wco.org.uk/uploads/files/files/rich-free-roblox-accounts_GM431946152.pdf
    • https://www.wco.org.uk/uploads/files/files/hack-coin-master-no-survey_GM406889139.pdf
    • https://www.wco.org.uk/uploads/files/files/free-daily-spins-coin-master-2021_GM406889139.pdf
    • https://www.wco.org.uk/uploads/files/files/download-coin-master-hack-tool-v1-9_GM406889139.pdf
    • https://www.wco.org.uk/uploads/files/files/claim-free-spins-coin-master_GM406889139.pdf
    • https://www.wco.org.uk/uploads/files/files/today-coin-master-free-coins-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005549.bin
23c8a6bfdc4d117c2ea8b216658ae661bd63e1575cab89b1cefc4a521099f998		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5549 27720 bytes
font_01_sfnt_off0000940d.bin
c4871d7a9fac3ab188a2e56e86996e0c49dc42d21a9daf4a9eb4f35130b88c58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x940D 18140 bytes

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