Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef07d79ac77b7f7a…

MALICIOUS

PDF

33.7 KB Created: 2021-07-01 23:41:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b20535499e968c4534a958325a885f83 SHA-1: 8d7b286783c6c13ea156ca070e4d8158e104229f SHA-256: ef07d79ac77b7f7af1f23a215afd3154f553eaec7d804af9ac727a9d6054efc1
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a document body that promotes free in-game items for popular games, acting as a lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, and the ML_NYX_PDF_MALICIOUS score is very high, suggesting malicious intent. The presence of embedded URLs and the nature of the lures point towards a phishing or scam campaign designed to trick users into downloading further malicious content.

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.co/app/431946152/roblox-tee-shirt-free-shipping-game-hack
    • https://knowledgekingdom.com.jo/aidata/blanc/files/coin-master-free-spins-heaven_GM406889139.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/coin-master-hack-2021_GM406889139.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/free-coin-master-spins-link_GM406889139.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/how-to-get-free-robux-hack-2021_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/how-to-get-free-robux-on-mobile_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/free-robux-generator-no-human-verification-no-download-no-survey_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/free-robux-all-credit-pastebin_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/free-roblox-accounts-with-robux-2021_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/roblox-hack-no-human-verification-no-survey-no-download_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/claim-free-spins-coin-master_GM406889139.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/coin-master-free-spins-2021_GM406889139.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/minecraft-free-download-ios_GM479516143.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/minecraft-windows-10-edition-free-download_GM479516143.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/coin-master-hack_GM406889139.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/roblox-lumber-tycoon-2-cheat-engine_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/roblox-framed-hack_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/coin-master-facebook-free-spins_GM406889139.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/show-me-how-to-get-free-robux_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/get-free-robux-no-human-verification_GM431946152.pdf
    • https://knowledgekingdom.com.jo/aidata/blanc/files/coin-master-no-download-app-but-play-for-free_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002eb3.bin
2cac5ca470dd07f7a60642d23a62b40ea5fdbfa781fb2905e3b606d1648d5f4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2EB3 21604 bytes
font_01_sfnt_off00005e2b.bin
346417996371250de6723118a0618f67981e0035f92f767247714edce7049608		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E2B 19216 bytes

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