Malicious PDF — malware analysis report

Static analysis result for SHA-256 710592090efacccf…

MALICIOUS

PDF

53.5 KB Created: 2020-08-31 08:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5cc929ad9481b5f1e526245718e007c8 SHA-1: db4063e19d4f8b8bb2e8ebf280103d58f8fa2ecf SHA-256: 710592090efacccffc1c71bd0f0e16eec2990a7fe39816451091bea3fc5952d0
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector infrastructure, indicating an attempt to lead the user to a harmful site. The document body, though heavily obfuscated, contains the URL that is also flagged by heuristics as a malicious redirector. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content.

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=la+musica+en+el+cine
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_f813b776b3b2450196a554948a86c5eb.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_78266cf41d2d46ff9c0a793faaa92bce.pdf
    • https://static.usrfiles.com/ugd/b8c837_da00b4db468d47fd86cf241cd1d0a477.pdf
    • https://static.usrfiles.com/ugd/d5cf39_b5a0844a62eb4b3daf4dcb3d433379ab.pdf
    • https://static.usrfiles.com/ugd/1b8612_d1138fc4345147429985fdb73e7f8f2c.pdf
    • https://static.usrfiles.com/ugd/9ec29b_d8ce5932ff554d1299215ce6a760df5a.pdf
    • https://static.usrfiles.com/ugd/856cea_3ec8055ff0104654b732339b4829360a.pdf
    • https://static.usrfiles.com/ugd/de02f3_eabf53a974514f50b68480d4b81f1d7c.pdf
    • https://static.usrfiles.com/ugd/b8c837_423f1dee98b64e0db23e64b60ffe3dff.pdf
    • https://static.usrfiles.com/ugd/b11f6d_cb3d573754a941d7b290c319c6e31bde.pdf
    • https://static.usrfiles.com/ugd/99afdc_870be7bf25474fd7bcc6d56af54f0ed3.pdf
    • https://cdn.shopify.com/s/files/1/0436/8036/6745/files/83700081576.pdf
    • https://cdn.shopify.com/s/files/1/0435/5080/2081/files/nutricion_parenteral_pediatria.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_off0000912d.bin
9cc461376d7f287cde185ba58b4de694e326c0673061c5038ce92b6ef6b18d9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x912D 4788 bytes
font_01_sfnt_off0000a160.bin
542374f91308161f0c80a3fd9d9c88c55608563dde3dd725d67fbdbcc894ea5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xA160 11796 bytes