Malicious PDF — malware analysis report

Static analysis result for SHA-256 e077e082a1fd6876…

MALICIOUS

PDF

62.6 KB Created: 2020-08-31 06:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2906cbb75af6f16a0cac0a3cd827e432 SHA-1: 646da51dc3801597df86687d309a375db62db776 SHA-256: e077e082a1fd6876e2499d39b93ffbaae483823e920755073649f9db03a3f538
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF file contains a significant number of embedded links, identified as a 'PDF SEO Link Farm'. One of these links, 'https://ttraff.ru/wix?keyword=sea+moss+benefits', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to contain the same URL, suggesting the primary purpose is to lure users to malicious sites.

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=sea+moss+benefits
    • https://static.usrfiles.com/ugd/b8c837_cb68066c48594a97925fb33432082abb.pdf
    • https://static.usrfiles.com/ugd/3e5d97_c64346146471413f8e1064430672b752.pdf
    • https://static.usrfiles.com/ugd/b8c837_774efeb839ad48a9a590285939142e34.pdf
    • https://static.usrfiles.com/ugd/b8c837_df6f6ee8a33d43d88d06016dfe9240d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_f41429a1127d412aaa97870cbc82fe1f.pdf
    • https://static.usrfiles.com/ugd/24853a_441e6fb703974d329ed699c1531dbdaa.pdf
    • https://static.usrfiles.com/ugd/dc8a8e_45c508d5494942c88c0a303ba4cb8223.pdf
    • https://static.usrfiles.com/ugd/739437_265bbd01605e4028aa7e21f57f29fb14.pdf
    • https://static.usrfiles.com/ugd/b8c837_486f1f31eea14163a8fc8d6835a42799.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ca6f42af8504f15a09752679f7346c2.pdf
    • https://static.usrfiles.com/ugd/b7ab08_26c9a6be40a646bab91f8a78abbbb254.pdf
    • https://cdn.shopify.com/s/files/1/0467/6019/8307/files/pledged_the_secret_life_of_sororities.pdf
    • https://cdn.shopify.com/s/files/1/0432/4153/7696/files/excel_vba_full_tutorial.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/
    • https://static.usrfiles.com/ugd/b8c837_cb6806

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b97a.bin
2e40b6b94babc378cbdb356f894c320505906502669667acb59aac1621f42b8b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB97A 5028 bytes
font_01_sfnt_off0000ca83.bin
d5b5bd8360d30012ec5dafa2583134c5f94fb65788998203847900ac1c6287c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA83 10288 bytes