Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4deb38dab4e1a21…

MALICIOUS

PDF

36.7 KB Created: 2020-09-03 02:39:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2ab3f010caac78e31901e23d20c023e SHA-1: 1d2e9b3e77518602697b1b81bd840d10cde114c7 SHA-256: b4deb38dab4e1a212f29ee6f195357421e05b663bdea9fa6631211f0762394ac
128 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. Additionally, it exhibits a link farm pattern, with many external PDF links, some of which are hosted on 'static.usrfiles.com'. The document body, though heavily obfuscated, contains the same malicious URL. The presence of a 'download button' heuristic further suggests a lure to trick the user into clicking the malicious link.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/wix?keyword=gradle+wrapper+version+android
    • https://static.usrfiles.com/ugd/451461_cb89bfe8dacd462da4c7130db73ca069.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_3c944337989d45e982c9bd452764245a.pdf
    • https://static.usrfiles.com/ugd/b8c837_972a347c37134841bd889e0d19d56688.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_9966b98f4e944eecb357b5939a444cc5.pdf
    • https://cdn.shopify.com/s/files/1/0462/4603/5607/files/full_sheet_of_plywood_size.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/puxiju.pdf
    • https://cdn.shopify.com/s/files/1/0465/4576/4510/files/lord_of_the_flies_reading_questions_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/2246/7750/files/63697150369.pdf
    • https://cdn.shopify.com/s/files/1/0431/1855/9389/files/2002_dodge_durango_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/4968/0028/files/23123879426.pdf
    • https://cdn.shopify.com/s/files/1/0434/9424/4516/files/66865323709.pdf
    • https://static.usrfiles.com/ugd/0ad6c7_cde7df9ed4ab4014817a486f02c5fe0f.pdf
    • https://static.usrfiles.com/ugd/963627_7abe6c140e5945fd996990c2f09c00f5.pdf
    • https://static.usrfiles.com/ugd/5b5da7_6a29aad8a79c4c37b7e36ca31538aad2.pdf
    • https://static.usrfiles.com/ugd/87a178_8b687fce31264d61b6b43a4d586f39f8.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_off00005281.bin
720205ddbe16a8d4537fc7e35cb80cddfd28a004b139d70620f1b882d794b978
pdf-font-stream PDF embedded font (sfnt) at offset 0x5281 5136 bytes
font_01_sfnt_off00006421.bin
6e41744df6d1517300b48d30440054c05947fdd7673004a72d3acd8260378d1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6421 10216 bytes