Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f6f4a6acdc5de5…

MALICIOUS

PDF

39.9 KB Created: 2020-09-03 23:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b9448f90054525ed2e1ef1b07fd19d3 SHA-1: af5cb2221158d2c33dca7c090126fd92ebcf6431 SHA-256: 18f6f4a6acdc5de56c45ee97e5394e549556d8e5d41eb736395c97c97678f994
154 Risk Score

Malware Insights

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

The PDF document contains a link to a known malicious redirector, ttraff.ru, disguised as a PDF to Word converter. It also hosts a large number of links to other PDF files, likely for SEO manipulation or to appear legitimate. The ML classifier strongly indicated maliciousness, and the embedded links suggest an attempt to redirect users to malicious infrastructure.

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=pdf+to+word+converter+mac+os+x
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6045/2760/files/39285837519.pdf
    • https://cdn.shopify.com/s/files/1/0427/8052/4710/files/metotojaziz.pdf
    • https://cdn.shopify.com/s/files/1/0436/0300/1502/files/converting_metric_units_worksheet_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0429/6874/4087/files/allis_chalmers_5015.pdf
    • https://cdn.shopify.com/s/files/1/0432/4088/2340/files/73594449745.pdf
    • https://cdn.shopify.com/s/files/1/0428/5412/1635/files/wibakatizexut.pdf
    • https://cdn.shopify.com/s/files/1/0430/8949/4177/files/8015679380.pdf
    • https://static.usrfiles.com/ugd/b8c837_7639605d2e23480d8678cb82f7e0aed6.pdf
    • https://static.usrfiles.com/ugd/5f226b_1e12dde178c44402aebba3d00b35311f.pdf
    • https://cdn.shopify.com/s/files/1/0435/1465/8980/files/27833190829.pdf
    • https://cdn.shopify.com/s/files/1/0440/4936/7190/files/how_to_get_paid_for_porn.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_off00005da2.bin
140765277437039e0a629f89acfea44c3d965f39fcdffae12f6919ae19144444
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA2 5356 bytes
font_01_sfnt_off00006fdb.bin
230170e4fd7a8c462d38607815c47bc35a505443d7bbf138adce58af83b2cd26
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDB 10300 bytes