Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4549ad9faaa78d8…

MALICIOUS

PDF

49.0 KB Created: 2021-05-13 01:37:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f29240d010a1fe84f7d521d78dc28518 SHA-1: acc1858fa4a58d9b9535c4c77795e12804d52a8b SHA-256: c4549ad9faaa78d8e20fa4884af3daf4d288356723af79cdf70e6626cf3b0316
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links and a document body that lures users with topics like "how to hack" and "free robux." The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm designed to redirect users to potentially malicious sites. The ML_NYX_PDF_MALICIOUS classifier also strongly flagged this file. The primary attack pattern involves tricking users into clicking these links, likely leading to further malware downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9228

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.xyz/app/431946152/how-to-hack-someone
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/how-to-earn-robux-for-free-2021_GM431946152.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/roblox-hack-me-robux_GM431946152.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/free-spin-codes-coin-master_GM406889139.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/free-robux-no-verification_GM431946152.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/get-free-spins-on-coin-master-2021_GM406889139.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/coin-master-free-spins-deutsch-download-2021-link_GM406889139.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/get-coin-master-cards-free_GM406889139.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/coin-master-free-spins-ios-2021_GM406889139.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/coin-master-rewards-2021_GM406889139.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/coin-master-free-spins-daily-2021_GM406889139.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/free-roblox-clothes-codes_GM431946152.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/minecraft-free-trial_GM479516143.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/free-coin-spin-daily-link-for-coin-master-game_GM406889139.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/free-coins-coin-master-link_GM406889139.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/how-to-hack-roblox_GM431946152.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/coin-master-online-hack-no-human-verification_GM406889139.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/free-minecraft-java-edition_GM479516143.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/minecraft-windows-10-edition-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d53.bin
a3cb0d5d7aaa1a85b08ed70cc631feaff5586462d911a8b6784301b3b21702e0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D53 28260 bytes
font_01_sfnt_off00008c63.bin
46298c5d5ae447a7f960c38f302748f6e55baad741241f538085fe7f03c38244		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C63 4096 bytes
font_02_sfnt_off000099db.bin
0830f2bc2b032c7ad37be74462a8461862374830fa053aba1852b18e492c5f08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99DB 19316 bytes

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