Malicious PDF — malware analysis report

Static analysis result for SHA-256 735cea04ba787987…

MALICIOUS

PDF

43.6 KB Created: 2020-08-24 20:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25ba4baae15dab1976e593d1641b379a SHA-1: c99fc0a1e08b97f2d0510834615c67dc3360bf87 SHA-256: 735cea04ba78798799d3d2e15d2deedcbcc9d66e40a566b8a2c4e45e20c3afa6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=dbs+check+address+continuation+sheet'. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, many of which are to benign Shopify domains but some are to unknown domains. The ML classifier also strongly flagged this PDF as 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.com/pify?keyword=dbs+check+address+continuation+sheet
    • http://roguter.warandpeacebuilding.com/uploads/1/3/0/8/130813837/249c7086.pdf
    • http://files.treeexpertscincinnati.com/uploads/1/3/1/3/131379615/sowidaresijubimegufo.pdf
    • http://nifudolap.bncnyc.com/uploads/1/3/1/4/131437549/fotebavaroworu-satijetuw.pdf
    • http://files.holleyslandscaping.com/uploads/1/3/1/0/131070378/44bde646268.pdf
    • http://jikon.behinddallas.com/uploads/1/3/2/3/132303301/benekubizi-wuderixuvut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1610/0776/files/caso_clinico_asma_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lonub.pdf
    • https://cdn.shopify.com/s/files/1/0437/7283/8039/files/zamenasavifewovupumubej.pdf
    • https://cdn.shopify.com/s/files/1/0438/0108/4064/files/91818978369.pdf
    • https://cdn.shopify.com/s/files/1/0431/3972/7509/files/the_thing_game.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6918/files/throw_some_mo_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kexikebesadunav.pdf
    • https://cdn.shopify.com/s/files/1/0431/6109/2247/files/byzantine_empire_map_worksheet.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_off00006dd5.bin
c6afe791030102f9ae5a0640751841bf3f90317d4c712bd98b185173b06c4bfe
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD5 5200 bytes
font_01_sfnt_off00007f6d.bin
11b042c52a0b2ce14dd1a8ac9a3e5226eb4ea0ef42a59015f98cdc6bf1d1687d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F6D 10112 bytes