Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda9759f83100299…

MALICIOUS

PDF

39.6 KB Created: 2020-08-31 08:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ec2e6315dba350624c071167eb4912a SHA-1: 3bb728fe3be6f9cf541d513785c5472bae004652 SHA-256: cda9759f83100299e83a91e5ace41b40638f41b9bbc5759598ef3b586f2b1203
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains a lure for 'mkwii xml download' and embeds multiple links. One critical heuristic indicates the PDF links to a known malicious redirector at 'https://ttraff.club/wix?keyword=mkwii+xml+download'. Another heuristic flags it as a PDF link farm, with many links pointing to 'static.usrfiles.com'. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document's content encourages the user to install a browser extension or update, a common social engineering tactic for malware delivery or credential theft. No scripts were extracted, but the embedded URLs and heuristics strongly suggest a phishing or malware distribution attempt.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.club/wix?keyword=mkwii+xml+download
    • https://static.usrfiles.com/ugd/26481d_565dcfa0fbb4432f92edea1ad2c6b4a7.pdf
    • https://static.usrfiles.com/ugd/3d0627_9648820316e34fc6b67c4c61c91fa3eb.pdf
    • https://static.usrfiles.com/ugd/3aca14_ed1567c4db1148ec87131a55c0de4099.pdf
    • https://static.usrfiles.com/ugd/912de2_274a57dd66f943ac89dcfa94f1f32265.pdf
    • https://static.usrfiles.com/ugd/4479ed_7ecc846086184fe496f5a1f5c14eda1e.pdf
    • https://static.usrfiles.com/ugd/b8c837_fec1fbf942ba4a808d1d1c814c909eef.pdf
    • https://static.usrfiles.com/ugd/05900a_6239aa8925d448a5a89bb4c3d3b83f4c.pdf
    • https://static.usrfiles.com/ugd/4bb894_23a6d1d99dfa43fd9a23af2e7790c0db.pdf
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/html_file_convert_to_free_online.pdf
    • https://cdn.shopify.com/s/files/1/0433/4364/2792/files/biblia_catolica_para_jovenes_descargar_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0438/0088/7456/files/8637268052.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7741/files/dajam.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_off00005add.bin
a062dba9fc4216e70153c22258758e37250fbb42666fb4a2fbe41cb74882101f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ADD 4924 bytes
font_01_sfnt_off00006ba6.bin
3f6e99574cff19aaed3ad7552dccd3cb2366f04b19e7a8cf9d13d4d50a7d748c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA6 11796 bytes