Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bdc6ca3490a9942…

MALICIOUS

PDF

93.1 KB Created: 2020-08-30 13:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c1378fdbfc6553b6794fc3c413655da SHA-1: f4a7c8b8deb937de7e01e9b6f2699864ae1a4c53 SHA-256: 0bdc6ca3490a99424967d72cd1c28630890793dd0fa746e034d7145d9e5367c4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=red+redemption+2'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which point to 'usrfiles.com'. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the same redirector URL, suggesting it's the primary lure.

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.ru/wix?keyword=red+redemption+2
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/67e251_a24c9f1d16814e3792e0e15c7a3d6968.pdf
    • https://static.usrfiles.com/ugd/a467d2_1ba76ba063954bdea784657755c5200c.pdf
    • https://static.usrfiles.com/ugd/b8c837_32d97ab57f0a47c9ab6851cf43d13cac.pdf
    • https://cdn.shopify.com/s/files/1/0437/6353/1933/files/grille_bataille_navale_vierge.pdf
    • https://static.usrfiles.com/ugd/defcb2_93968633468d4d0d9bfe598402c0ec3e.pdf
    • https://static.usrfiles.com/ugd/ee6770_39f33bc7a015489886c8d91642ee96c3.pdf
    • https://static.usrfiles.com/ugd/cd79e3_a80d8f07d12849a893c4e37db9db5e23.pdf
    • https://static.usrfiles.com/ugd/ceb2e8_37f569238fc8483d8892ac58545ca03a.pdf
    • https://static.usrfiles.com/ugd/b8c837_6366e65a4a3b459eb9fa0198f48752ea.pdf
    • https://static.usrfiles.com/ugd/a31856_a2e5dc8a942247238907a5a397091ad2.pdf
    • https://static.usrfiles.com/ugd/b8c837_16e7d89d06c64bd5ab6d66e6ba37cc17.pdf
    • https://static.usrfiles.com/ugd/79e0dc_d541aa11974e46b8865fbc87b7c68710.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001320b.bin
424edead254f7348bfa76efc0f476a79d6c17d731f5748e23b97bea85d2f0bfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1320B 4824 bytes
font_01_sfnt_off0001425d.bin
848708302e79cfa9b89e993ce7621148bf73ad37fd4c1c675e7b98090a5339ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x1425D 10812 bytes