Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f08f8b53767475…

MALICIOUS

PDF

37.5 KB Created: 2020-09-04 23:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6a04213227e8482b3a6bdddfe299bdf1 SHA-1: 1528b92666b1539550285e01a19a1d3fd7252e1f SHA-256: 51f08f8b53767475252d5b81c5a6ce97c36d0a346769ebd4701f759feb37f733
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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/pify?keyword=vidmate+app++install+new+version+9apps In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/ea2f88_cbaddd2cd7c64ea7986d6456cf025b6e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/eb5a6a_6755f75a05a2464e8744dc7011f2c22d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8b2c09_9793ffb9ca614a7c9b26869f6be861d3.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_f93452b4e75f4affa44ca5eb0e7cccdf.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c46c8a_781aee088a15417ebd332660d2fdce7f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c81504_474c0b98ff0d4446a0cd811f6d385d22.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/bae363_01119a29a337438b9b38a4bef10f6f51.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4bb894_71e4bfb093ab484bae9c71732650742c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/38bf1f_e6acd9a6784e41848e31a73f51c0d571.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0a052f_c645c535dd274967ab414781dd427b68.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6f53d7_4fcdab3d4dc84f22ade04d63318e10f0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/70e5f7_b4709618fbe747488a0cc8eb887a2530.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0baf77_e3c5bae222ca4589a8fefc44334122d6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/39cb9d_0a785f2b0aa54740aa9200ed902761d0.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000553e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x553E 5380 bytes
SHA-256: 831a9f141eb93218d5501ae8c85e8d80b07c228dbda16024f0a65e3a5893d22c
font_01_sfnt_off00006783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6783 9852 bytes
SHA-256: 8a3974501b878cc1dd63cb7d76a7aca3ade4933f973b868fcdba9a3424b2cec3

Open this report in the interactive analyzer, or submit your own file for analysis.