Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf1c1642ac9573d5…

MALICIOUS

PDF

44.9 KB Created: 2021-06-03 08:32:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c72585d34147c126980c0fda9b2d7554 SHA-1: 69ae46422ac5140e959fac790f77c50c14806715 SHA-256: cf1c1642ac9573d5bc14cc55c75ca2335aeaf1f4b54849a618d0c1b6561f202b
142 Risk Score

Malware Insights

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

The PDF contains numerous embedded links and a primary external URI pointing to game-related hacks and cheats, suggesting a lure for users to download further malicious content. The presence of a 'password-protected archive handoff' heuristic indicates that the document may be designed to conceal a payload, requiring user interaction to decrypt or access it. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/406889139/coin-master-hack-pro-gamers-game-hack
    • https://library.sman1berau.sch.id/repository/coin-master-free-daily-spins_GM406889139.pdf
    • https://library.sman1berau.sch.id/repository/get-free-lives-on-coin-master_GM406889139.pdf
    • https://library.sman1berau.sch.id/repository/coin-master-free-spin-and-coins-links_GM406889139.pdf
    • https://library.sman1berau.sch.id/repository/free-roblox-accessories_GM431946152.pdf
    • https://library.sman1berau.sch.id/repository/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdf
    • https://library.sman1berau.sch.id/repository/extra-free-spins-for-coin-master_GM406889139.pdf
    • https://library.sman1berau.sch.id/repository/coin-master-hacking-news_GM406889139.pdf
    • https://library.sman1berau.sch.id/repository/xray-hack_GM479516143.pdf
    • https://library.sman1berau.sch.id/repository/can-you-get-robux-for-free_GM431946152.pdf
    • https://library.sman1berau.sch.id/repository/free-online-minecraft-server_GM479516143.pdf
    • https://library.sman1berau.sch.id/repository/is-minecraft-free-on-nintendo-switch_GM479516143.pdf
    • https://library.sman1berau.sch.id/repository/coin-master-free-download-for-pc_GM406889139.pdf
    • https://library.sman1berau.sch.id/repository/how-to-get-roblox-premium-for-free_GM431946152.pdf
    • https://library.sman1berau.sch.id/repository/roblox-no-download-hack_GM431946152.pdf
    • https://library.sman1berau.sch.id/repository/free-minecraft-maps-pe_GM479516143.pdf
    • https://library.sman1berau.sch.id/repository/can-pubg-uc-be-hacked_GM1330123889.pdf
    • https://library.sman1berau.sch.id/repository/free-links-for-coin-master_GM406889139.pdf
    • https://library.sman1berau.sch.id/repository/coin-master-hack-ios-no-human-verification_GM406889139.pdf
    • https://library.sman1berau.sch.id/repository/free-robux-no-scam_GM431946152.pdf
    • https://library.sman1berau.sch.id/repository/how-to-hack-roblox-passwords_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005347.bin
3c8dd9f9ea4c7a23913509f818243626a86e8fa8c753e7c45d4b3b459dd6e7a5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5347 25732 bytes
font_01_sfnt_off00008d7d.bin
7c3ba000fcc9e82367a9cf09e7428e48624a936725f215f3086fe1b405a0b7f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D7D 18132 bytes

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