Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee0b6b10ea975f49…

MALICIOUS

PDF

49.8 KB Created: 2020-08-31 06:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36f54c68df0c2151541123e2d8c6fee1 SHA-1: 9cabbd80455a5f22a8b3bbd9c013cd58a697d827 SHA-256: ee0b6b10ea975f497d5ee983fff33b2c54c30970153d1f9a8b9cb26db428f5b3
152 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, identified as a link farm. One of these links, https://ttraff.cc/wix?keyword=bdo+freshwater+crocodile, points to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be malformed or corrupted, but the presence of numerous links suggests a lure to external content, likely malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.cc/wix?keyword=bdo+freshwater+crocodile
    • https://cdn.shopify.com/s/files/1/0431/1570/8573/files/perutepipilalojel.pdf
    • https://cdn.shopify.com/s/files/1/0440/4382/9398/files/8453618618.pdf
    • https://cdn.shopify.com/s/files/1/0428/9524/5475/files/vapizukumifajobutatifiti.pdf
    • https://cdn.shopify.com/s/files/1/0437/0432/0154/files/40112894851.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6652/files/bobofobugabobafanedugo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4452/7528/files/48663692235.pdf
    • https://cdn.shopify.com/s/files/1/0439/4100/3432/files/akashic_records_in_tamil.pdf
    • https://static.usrfiles.com/ugd/b8c837_e125ae4e91294d01ae199ca72fba06ab.pdf
    • https://static.usrfiles.com/ugd/b8c837_c60a33eac6584991969a75197cdb0190.pdf
    • https://static.usrfiles.com/ugd/b8c837_42717236b40443d0974665c2105e88a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9f5f7f5379e4876ad58c30ace4d4944.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_off000084de.bin
2ea8e8321bd2060a75fd24cb9a97fd9a7a480530fefbed4099b8c1cec0735e91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84DE 5248 bytes
font_01_sfnt_off000096c7.bin
53814edf0079ac408ea2f2ac79a3337155637dbaf79cae64b9e837b1e7afb46b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96C7 10524 bytes

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