Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eba2fcd94751802…

MALICIOUS

PDF

34.4 KB Created: 2020-08-21 17:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 977a1f3ce58bdab0ee3640787f1cc60f SHA-1: e68af2a0fb997e1446f531992b26e502998f1db4 SHA-256: 4eba2fcd94751802d6e278b80dad890b96cace0d3462bd107e313be027301d23
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, disguised as a 'matlab wavelet toolbox user guide', leads to malicious infrastructure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF documents, likely for SEO poisoning or to obscure malicious activity. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ttraff.ru/pify?keyword=matlab+wavelet+toolbox+user+guide
    • http://files.brolouiscanter.com/uploads/1/3/2/7/132710763/gasafutiweb-logafoweli-xupaxebuxog-jeganese.pdf
    • http://kunupunus.rescuedfirewood.com/uploads/1/3/1/3/131383541/3829052.pdf
    • https://cdn.shopify.com/s/files/1/0430/6717/9162/files/10th_english_book_back_answers_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32377204601.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/54106370322.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8973/files/leishman_principles_of_helicopter_aerodynamics.pdf
    • https://cdn.shopify.com/s/files/1/0436/5923/1385/files/branches_of_abdominal_aorta.pdf
    • https://cdn.shopify.com/s/files/1/0431/7747/6253/files/wemafamabubodo.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/75336598376.pdf
    • https://cdn.shopify.com/s/files/1/0433/5815/9006/files/82778157129.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000045aa.bin
1f11080f891ddbd1da7c8e341f5904771751d306762e46cde98a6b05c3bc17c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45AA 5360 bytes
font_01_sfnt_off0000580c.bin
6a06a8f3167b86a2851e6662b9df1b53e65826830e8946ccf722430f9074ad24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x580C 10520 bytes

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