Malicious PDF — malware analysis report

Static analysis result for SHA-256 85026fc20ac3d237…

MALICIOUS

PDF

41.9 KB Created: 2020-08-30 11:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31ea3c55020f937ab30decf24c1083bc SHA-1: 40fec3c9b7f0daa5a94c507aeb8b916b8d41f818 SHA-256: 85026fc20ac3d2370476455f65ec9c12acb7d9801db268dd31e6280e0c1973bb
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for users to click on malicious links. The presence of numerous external PDF links further suggests a link farm or redirection scheme designed to lead users to 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=the+soldiers+email+order+bride+read+online+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_00a9562b2044405db30aef232bb75b87.pdf
    • https://static.usrfiles.com/ugd/f1d680_bb7af894e6c2476990329e378528bc97.pdf
    • https://static.usrfiles.com/ugd/d78803_4d2d260c76c04e7c85ea1f206c2c15ce.pdf
    • https://static.usrfiles.com/ugd/7603ae_36f689b3bc02429fbf7ab24af1c877fb.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e89944775ce4cac9cbbc9645d74763d.pdf
    • https://static.usrfiles.com/ugd/a18aa6_ace1b2eefc794a18a7a738afd759f3f4.pdf
    • https://static.usrfiles.com/ugd/0ebc1f_4acec88601c74d08980b7fae80330e09.pdf
    • https://static.usrfiles.com/ugd/b8c837_216199422f274026a51ee88479231818.pdf
    • https://static.usrfiles.com/ugd/b8c837_62b78e39804f440782b6e0176d7cc81b.pdf
    • https://static.usrfiles.com/ugd/5b9a87_46c4f48393724a2c86c0481423ad5c3e.pdf
    • https://static.usrfiles.com/ugd/d01287_e66b66d6cc48461ea3c10e657ca9c453.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_9303e0f72da542c3be28fa845d2c430f.pdf
    • https://static.usrfiles.com/ugd/b8c837_7094a8965da7427196345dcf8399505a.pdf
    • https://static.usrfiles.com/ugd/0047a4_63593c732df041e886fe2cec4e8122de.pdf
    • https://static.usrfiles.com/ugd/b8c837_06f4b874ea354103be66a26c2c57c641.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_off000066b5.bin
5bb1654c0cb82c32b1de09d4a3cc8478a38408d50746f37aff21517e1918e8f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x66B5 5236 bytes
font_01_sfnt_off00007859.bin
867ae969ebcbb5105d13797f3ff07f8427307f166aa9e4a4efbc6abb872f9936
pdf-font-stream PDF embedded font (sfnt) at offset 0x7859 9996 bytes