Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f4a0d7a7067bbe…

MALICIOUS

PDF

42.3 KB Created: 2020-08-12 05:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bffa204ac5875ca476c44de8e310c995 SHA-1: b01729a860a697e38ca6b5e28f0f58b5210891a2 SHA-256: f0f4a0d7a7067bbe849957802038222561313637f79e3c7976373f6de587f967
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to its inclusion of a link to a known malicious redirector. Additionally, it contains a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was largely unreadable binary data, but the presence of the malicious redirector and the link farm are sufficient indicators of malicious intent.

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=asciidoctor+pdf+maven+example
    • http://lavogogas.timwarnerlab.org/uploads/1/3/1/3/131383664/romugedaxov_xuvufaxufe_nofikupeje_xapaxijilos.pdf
    • http://files.bestofboisemoving.com/uploads/1/3/1/3/131379420/1123656.pdf
    • http://damimegek.jordandeadseaminerals.com/uploads/1/3/0/9/130969472/eec5f7997cf3.pdf
    • https://cdn.shopify.com/s/files/1/0435/6420/4193/files/29871158835.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/86953505774.pdf
    • https://cdn.shopify.com/s/files/1/0434/3732/6488/files/fetebojukavoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9673/files/wozarave.pdf
    • https://cdn.shopify.com/s/files/1/0432/1096/5147/files/disev.pdf
    • https://cdn.shopify.com/s/files/1/0429/6913/7305/files/pdf_file_reader_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0431/0482/9602/files/32781477166.pdf
    • https://cdn.shopify.com/s/files/1/0429/6271/4773/files/36420794872.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/o_mio_babbino_caro_violin.pdf
    • https://cdn.shopify.com/s/files/1/0434/4951/6199/files/nakut.pdf
    • https://cdn.shopify.com/s/files/1/0437/5294/7873/files/paweforakazefarefudeposo.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_off000066d4.bin
6b242bc65c62818d56b977c76d8831dc486d36f4e9884eeefeae169606278294		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66D4 5416 bytes
font_01_sfnt_off0000792c.bin
20f8c48c2068a580ac36161e5503a305a1d2e349a154197dfd47923a2a123323		 pdf-font-stream PDF embedded font (sfnt) at offset 0x792C 10376 bytes

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