Malicious PDF — malware analysis report

Static analysis result for SHA-256 f455aaea489f6756…

MALICIOUS

PDF

39.0 KB Created: 2020-08-29 23:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c388b51a64b3dfb1b4230703a44eedf SHA-1: 3d62b164747ca856889be494c0d01c37a491c254 SHA-256: f455aaea489f6756079f1d92e6ebb16ad515fbb10a2182413a47cfa4e3412a69
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one pointing to a known malicious redirector. The document body is heavily obfuscated, but the presence of numerous external links, including one to a redirector, suggests a malicious intent, possibly for SEO abuse or to lead users to malicious sites. The file was generated by wkhtmltopdf, a tool often used to create PDFs from web content.

Heuristics 3

  • 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.
  • 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=simple+past+irregular+verbs+affirmat
    • https://static.usrfiles.com/ugd/b8c837_c65e3101ec13487ab30f08d85057d4a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_654318febe3c4c898b880f985123ceab.pdf
    • https://static.usrfiles.com/ugd/b8c837_df9425b1107f434980d2b65a8f06db52.pdf
    • https://static.usrfiles.com/ugd/b8c837_3a8f1a9597654616a077a12e8ce25a2d.pdf
    • https://static.usrfiles.com/ugd/b8c837_a158be0dca7143db9bc04fc4dba28240.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e6c73a0db134c0095ad4887dd126290.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_60bf69a2e1834e0f86afc4c8ae196f8d.pdf
    • https://static.usrfiles.com/ugd/b8c837_dcf30839bb4f44938fac5f89738432c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_7833f64966f34f469fad80d53459a300.pdf
    • https://static.usrfiles.com/ugd/b8c837_dce3492ddc904da6843f81230637b7e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b30166810744730a5fff6f5805142f8.pdf
    • https://static.usrfiles.com/ugd/3cb679_c08ba124fbf946888897824edfb65fae.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_off00005971.bin
e307856992e99715850c3d73edb045a8b9d189f9632fba485ba2795557f5657f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5971 5524 bytes
font_01_sfnt_off00006c1e.bin
1edeb679fd1cb529a63642de842e48a64fc4ff7ad81788abd117534333931c8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C1E 10460 bytes

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