Malicious PDF — malware analysis report

Static analysis result for SHA-256 879163220c95da9b…

MALICIOUS

PDF

34.0 KB Created: 2020-08-30 10:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8390440c9b37a1c7797e0d6e29e79efa SHA-1: 9097ac1d4653c4455fb06ab8d8d208969a7432f0 SHA-256: 879163220c95da9b92ef7f38056bde9067a41e119267ada1279030e204c6fdd7
154 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, with one pointing to a known malicious redirector. The heuristic firings indicate a high likelihood of malicious intent, specifically a link farm designed to redirect users. While no scripts were extracted, the presence of multiple links and the malicious redirector URL strongly suggest an attempt to lead users to harmful content, potentially for phishing or malware distribution.

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.me/wix?keyword=killer+keos+skimpy+cbbe+v2-v3+armor+replacer+sse
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_d757f9cded0e4b08a6758a3d5a52a81b.pdf
    • https://static.usrfiles.com/ugd/d54300_f61226bfb7294d80ab8abffe07d4a8da.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b43aa52fe5544a390e22e3d4a170f3b.pdf
    • https://static.usrfiles.com/ugd/b8c837_dfe740756e4745bbb9da2d2cc664978e.pdf
    • https://static.usrfiles.com/ugd/a18aa6_aa3a1c1d902d4725b188cf375ee7812c.pdf
    • https://static.usrfiles.com/ugd/b8c837_84e7eea281714fa3a1c0a06a05a3401c.pdf
    • https://static.usrfiles.com/ugd/9e53d4_42b1a6f9e43347fca8f0de37582ce215.pdf
    • https://static.usrfiles.com/ugd/b8c837_991e4aabd90e40d9a871c1730d796e90.pdf
    • https://static.usrfiles.com/ugd/b8c837_23b49f4d1d194ea6ab94de09e6916209.pdf
    • https://static.usrfiles.com/ugd/b8c837_33b5473b48854912a814f3597e7a1539.pdf
    • https://static.usrfiles.com/ugd/3ab5ed_d54d72dc864d415d86b083544353beb5.pdf
    • https://static.usrfiles.com/ugd/0a0016_1f52a3bfef0b4bb3b5ac2389bd5cca44.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_off000045a2.bin
de7cd56d1e30680a4fb41ab3a1e25a5a976e0ae00469f45140d8532375b299a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x45A2 5744 bytes
font_01_sfnt_off0000591a.bin
2660db2fd3ef6b45daa716e97f5328f0eff716e64752e495475888685b59fda0
pdf-font-stream PDF embedded font (sfnt) at offset 0x591A 10080 bytes