Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a31ece58944e1a…

MALICIOUS

PDF

44.4 KB Created: 2020-09-09 08:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb9c294bbe6403233fd2aedd38f2cb5c SHA-1: 1c5b45221c63d9cb8dd1630aa31c54cc4d4ada42 SHA-256: 45a31ece58944e1ad52b7d8bedcf1c3601ad0c7fe33b5bb916785966ea1e73df
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm with numerous embedded URLs, including one pointing to known malicious redirector infrastructure. The primary malicious URL is 'https://ttraff.link/wix?keyword=fishbone+diagram+medical+template', which is likely intended to lure the user into downloading further malware. The ML classifier strongly supports the malicious nature of this PDF.

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.link/wix?keyword=fishbone+diagram+medical+template
    • https://cdn.shopify.com/s/files/1/0431/2032/8865/files/dixelubamumimivojorufal.pdf
    • https://cdn.shopify.com/s/files/1/0431/8124/4573/files/mixutefivobukujubujumasa.pdf
    • https://cdn.shopify.com/s/files/1/0435/0102/7493/files/python_best_practices.pdf
    • https://cdn.shopify.com/s/files/1/0427/9641/7191/files/47316416807.pdf
    • https://static.usrfiles.com/ugd/10b03a_8d16d4be2e964447ba7973882c07002d.pdf
    • https://static.usrfiles.com/ugd/314c35_bf811d15c0ef4ce6ae2889b505e208bf.pdf
    • https://static.usrfiles.com/ugd/122077_0fea884b83734e4dbe25f7140c523c4b.pdf
    • https://static.usrfiles.com/ugd/5c7528_36411cdc366f46a7a4c0be4231387781.pdf
    • https://static.usrfiles.com/ugd/11276f_fccefc7d8e8542f9baaf53ebc8390540.pdf
    • https://cdn.shopify.com/s/files/1/0431/7960/6177/files/cisco_ccna_1_introduction_to_networks.pdf
    • https://cdn.shopify.com/s/files/1/0438/8998/3640/files/from_dusk_till_dawn_season_4.pdf
    • https://cdn.shopify.com/s/files/1/0440/5572/4197/files/facebook_online_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0431/9477/7760/files/automotive_parts_list.pdf
    • https://cdn.shopify.com/s/files/1/0429/6366/5055/files/nilaputizajila.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000628b.bin
93f5fa61ec1ee847ebd185692a5ec6c2392dbae646762b6fd8f85a245a66cc93
pdf-font-stream PDF embedded font (sfnt) at offset 0x628B 5368 bytes
font_01_sfnt_off0000748d.bin
21b2f5e5958c3ddc455373d170d0c7c864fb2a83c10e701882f69b0ce5398efd
pdf-font-stream PDF embedded font (sfnt) at offset 0x748D 10092 bytes
font_02_sfnt_off000096c9.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x96C9 4324 bytes