Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd47a7a929b1a9b0…

MALICIOUS

PDF

46.7 KB Created: 2020-08-31 07:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f90519c74467b0f90875fd53b989cb23 SHA-1: b7e6464cda61eca92f2b277e7e9ff5db8d7dd7ed SHA-256: dd47a7a929b1a9b0ac09d682680ef0637d1f064fce041f5ca28b99ab70f39225
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The document body text is largely garbled, but the presence of numerous links, including a link farm, suggests an attempt to lure users to malicious websites. The ML classifier also strongly indicated maliciousness.

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.com/wix?keyword=nashville+shuffle+fiddle
    • https://cdn.shopify.com/s/files/1/0436/2380/9187/files/angular_download_blob.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/understanding_by_design_professional_development_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0437/1375/7339/files/kowitu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5430/8251/files/74589226161.pdf
    • https://static.usrfiles.com/ugd/3aca14_c9de90be9f34453d8b1ba8c149547f5f.pdf
    • https://static.usrfiles.com/ugd/191a6d_77c44f7289cd49879cbad67fcadf7b57.pdf
    • https://static.usrfiles.com/ugd/3e87bf_d2b008dd74c54207aefb4f16ef2eb4f5.pdf
    • https://static.usrfiles.com/ugd/d5cf39_3933a90f9c4947de8e879ba5f18ec199.pdf
    • https://static.usrfiles.com/ugd/b8c837_da2133d936164a218f79a8d2f4a3d882.pdf
    • https://static.usrfiles.com/ugd/b8c837_cdfc22dafde64875ada98deafc55b3ca.pdf
    • https://static.usrfiles.com/ugd/b8c837_7b45f645a8f446e1a05ee991c4a83db5.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_off000079ff.bin
8bfa41e81d270bd29b1085bd752f4bf4525b04bdcb32ff063f704268f2c15f15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79FF 4928 bytes
font_01_sfnt_off00008ac9.bin
624f8fc76a3976860fd792fe68d1ae724be7bcf2b7dc47c5e9cad23bab02c111		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC9 10012 bytes

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