Malicious PDF — malware analysis report

Static analysis result for SHA-256 506671b16854b46d…

MALICIOUS

PDF

46.5 KB Created: 2020-08-31 22:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c81b92656f93c224f8a08e07b1e126b1 SHA-1: 154f0c535a62593859d3f0e193288c4eb56cfb60 SHA-256: 506671b16854b46df7ac8b05868aad3d4f4151452e42bd58201a5d280e1a0c40
152 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous links to external PDFs, likely intended to redirect users to malicious content. One of the primary links, 'https://ttraff.ru/pify?keyword=the+age+of+adaline+full+movie', is flagged as a malicious redirector. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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/pify?keyword=the+age+of+adaline+full+movie
    • https://static.usrfiles.com/ugd/b8c837_ce64934b18b9454eb1cd4b0ec1c38508.pdf
    • https://static.usrfiles.com/ugd/b8c837_f34215f092ac48278fae250fb24fbc18.pdf
    • https://static.usrfiles.com/ugd/b8c837_aeb2c51e61864088a723f52a2f679481.pdf
    • https://static.usrfiles.com/ugd/0511f5_c591d2b499c543c982ae0446fc6a04a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_2ea3711ed59f43fa8387ef0deb4c719f.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0d5f7a0aaf34f9e8a31f1af57986d26.pdf
    • https://static.usrfiles.com/ugd/b8c837_1d9d6dc979fe4e8493946f2e5b0cc57e.pdf
    • https://static.usrfiles.com/ugd/ee6770_f0fdd0d093b44edd8e5f0463a1565988.pdf
    • https://static.usrfiles.com/ugd/54fa57_0ab82c3a9b0d427aba5beb661066bffb.pdf
    • https://static.usrfiles.com/ugd/3e87bf_0932101d1e4541f18b11fbb85752f94d.pdf
    • https://cdn.shopify.com/s/files/1/0433/3846/5435/files/vafosajitajamefagukapipa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9639/2348/files/xezitimexejovesemuwub.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/bivujewejotexikisururulev.pdf
    • https://cdn.shopify.com/s/files/1/0439/6960/9886/files/21319439331.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007888.bin
62c07afb68491af7ae5363073d72f2cc9f36d21f5810cb65f13bde01918d2c3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7888 5056 bytes
font_01_sfnt_off000089a4.bin
a8e33263febdebb2c3f898e420fc93a42e0120ecdaa4b5424d0479767fb546c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x89A4 10524 bytes