Malicious PDF — malware analysis report

Static analysis result for SHA-256 612f7f2b7877400b…

MALICIOUS

PDF

46.4 KB Created: 2020-08-31 13:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6c7ff83d45770cfb0dcdcbaba2d99cf SHA-1: 4a995e7596af563471c7be8ede75d250aa6f617e SHA-256: 612f7f2b7877400bd53f3920350d6b79b80bb5358351ac9939b942783c0c150b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with the primary URL identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to create a link farm for SEO poisoning or to direct users to malicious content. No scripts were extracted, but the presence of a malicious redirector URL is a high-confidence indicator of malicious intent.

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=sew+cute+to+cuddle+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/538d67_b44be831f817495a9040b90f4038169f.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ba8fa64ff2146f39c01d83a7ed68bbf.pdf
    • https://static.usrfiles.com/ugd/b8c837_1638111e37bd4c80b3b30bbc8a6ccb82.pdf
    • https://static.usrfiles.com/ugd/cd79e3_ac336fc3bf694c93ab12366f4c602b70.pdf
    • https://static.usrfiles.com/ugd/47b1e8_2b6166b901df426fb2e35ee46b31e440.pdf
    • https://static.usrfiles.com/ugd/2f07a1_a00151321a724b2a9bc3be0b16416dbb.pdf
    • https://static.usrfiles.com/ugd/e8506d_1b9a5fea5e6646119b0390e8e1a62d6f.pdf
    • https://static.usrfiles.com/ugd/a107db_8486cd7d1a6a4fb98364d66d6faed46c.pdf
    • https://static.usrfiles.com/ugd/b8c837_b3038ad3382743449eeb5dded17d5135.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_a60acf9f01e44fb098e568b22d52d269.pdf
    • https://cdn.shopify.com/s/files/1/0432/8528/2980/files/11264800944.pdf
    • https://cdn.shopify.com/s/files/1/0436/5392/2981/files/puvegajosok.pdf
    • https://cdn.shopify.com/s/files/1/0439/1328/1688/files/gedepigijesosiri.pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/2305821271.pdf
    • https://cdn.shopify.com/s/files/1/0435/5578/2817/files/66312797524.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_off00007342.bin
06b3f05bbfdadc71f3039848e38e8648fbbef3f81134d4c288475e74adeeabd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7342 4860 bytes
font_01_sfnt_off000083fd.bin
72a2431ec22cab37f9e4481e848e2580150f78dd947111c084d12915378efafd
pdf-font-stream PDF embedded font (sfnt) at offset 0x83FD 12532 bytes