Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad50ebbd9363bfe…

MALICIOUS

PDF

36.2 KB Created: 2020-09-02 11:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d5ffb00eab6e2039b3903ad0f43fbf7 SHA-1: 631beba4438d279ee04afe97eba47f03c3808e2f SHA-256: 7ad50ebbd9363bfe21c48873fe271a6cab22132b87a1bb3762af4d57ebd8f566
154 Risk Score

Malware Insights

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

This PDF document contains numerous links, including one to a known malicious redirector at https://ttraff.ru/wix?keyword=high+level+weather+report. The document body, though heavily obfuscated, appears to be a lure for a weather report, likely to trick users into clicking the malicious link. The presence of many links to external PDFs suggests a link farm or SEO manipulation tactic to distribute the 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=high+level+weather+report
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/04e6f9_8c43419ce1e2426d8be6da27fc911a1a.pdf
    • https://static.usrfiles.com/ugd/7ff653_44cb0d2dea9943eb801734bf0408a044.pdf
    • https://static.usrfiles.com/ugd/b8c837_49723570578744938ae893b0c9c2b14f.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f8db4302e5f4fa99060525ba0e440dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_acd4e2360e3442e3b86e781b90b26e2c.pdf
    • https://static.usrfiles.com/ugd/b8c837_2d3cda777fb04cb7a015a2ca25fbe9f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9269d17b71a4edd87cb2a3594e3f91f.pdf
    • https://static.usrfiles.com/ugd/c4ccc4_eab9510eb31f4cc8b69c5277b89cd66c.pdf
    • https://static.usrfiles.com/ugd/b8c837_909093583bfc4f7880e0198000c6c45a.pdf
    • https://static.usrfiles.com/ugd/f64db8_a21b54f45e0b4c1f9afe8af4746995b6.pdf
    • https://static.usrfiles.com/ugd/238140_c2c7b12475764f4496ac07b9d558e79c.pdf
    • https://static.usrfiles.com/ugd/21e6f2_9a5af7dae2924ddcb7d7070eda3df41d.pdf
    • https://static.usrfiles.com/ugd/b98abb_3d941c33290444d3ab796a68baa35362.pdf
    • https://static.usrfiles.com/ugd/286fb8_1572a2e2b9fd4027b59a6234eb1cd035.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_off00005142.bin
c91fea54d931fa1144b11432ebfee739be25f65616b992a3b513e5e3d18c407f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5142 5016 bytes
font_01_sfnt_off00006266.bin
e088c65682fa16dd1ea9d3d5296331f3a9d3be2cebf3c8dad5005fc09d27ee52
pdf-font-stream PDF embedded font (sfnt) at offset 0x6266 9856 bytes