Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b02b0909fd3e5c4…

MALICIOUS

PDF

45.1 KB Created: 2020-09-01 06:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd6976689e1b267048293af364187378 SHA-1: dc3ea64b386b8607717f34de0d8ae54b58019ddc SHA-256: 4b02b0909fd3e5c4d81bc57a1c0f2271a08a567519c0d6d0676101952a219ba1
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, forming a link farm. One of these links, 'https://ttraff.me/wix?keyword=absceso+periapical+sin+fistula+tratamiento+pdf', is identified as a malicious redirector. The document body is heavily obfuscated and contains what appears to be junk data, but also includes the malicious URL and several benign URLs from static.usrfiles.com. The primary malicious activity appears to be directing users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.me/wix?keyword=absceso+periapical+sin+fistula+tratamiento+pdf
    • https://static.usrfiles
    • https://static.usrfiles.com/ugd/5fd5c1_44da04b23a9e4dc69bad151d72b5bc9e.pdf
    • https://static.usrfiles.com/ugd/0c41e7_1b90a53c3ede4889b22cac5952cace47.pdf
    • https://static.usrfiles.com/ugd/7baf93_34b2d3b7581c4cdea2915a155dec6b64.pdf
    • https://static.usrfiles.com/ugd/3bcfef_76ea2765557e4699988ce0c86adb2c16.pdf
    • https://static.usrfiles.com/ugd/defcb2_1e38f185722e47a38db0c307175da77f.pdf
    • https://static.usrfiles.com/ugd/704566_ee0b6677e2b9448da5a20cfe9bcb5020.pdf
    • https://static.usrfiles.com/ugd/69b86f_72445367dd4e4bc2a7887cfdf8f07332.pdf
    • https://static.usrfiles.com/ugd/defcb2_e30d17a71d7545a886322974c517d27b.pdf
    • https://static.usrfiles.com/ugd/d902bb_0c283bb49f95459984e5d13cb9903d2e.pdf
    • https://static.usrfiles.com/ugd/b5aed9_d4f508486b8c4694b634c7aee767ac54.pdf
    • https://static.usrfiles.com/ugd/b8c837_1fdf14fbccdf47169eb3b1d1f1c95a63.pdf
    • https://static.usrfiles.com/ugd/9e41f0_455b8b68faa74149b3058d29b26d968c.pdf
    • https://static.usrfiles.com/ugd/6f53d7_65a3176723b249bda4a7378c001a6548.pdf
    • https://static.usrfiles.com/ugd/b5472a_87e77e24ed6c4e91984aae32531a5443.pdf
    • https://cdn.shopify.com/s/files/1/0430/6301/7629/files/15843130600.pdf
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/jeep_patriot_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0457/7371/7660/files/descargar_punteros_para_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0438/1723/8685/files/either_or_neither_nor_worksheets_with_answer.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_off00007330.bin
e775b5a940ffe482fc890aa2569c78286b5f4a7c2e4a1cad010d2e2b449f1009
pdf-font-stream PDF embedded font (sfnt) at offset 0x7330 5432 bytes
font_01_sfnt_off00008586.bin
7e22043ab8d79a3f6feca9ae6bbaa8ee26363307756103c19d8d396cdf6e0cd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8586 9660 bytes