Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac800c4119fa93c6…

MALICIOUS

PDF

47.6 KB Created: 2020-09-07 21:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e912d189e4dca9a495db70d5172f2b0 SHA-1: 6955e8993a539e4453c809e2472bff4643c7fec1 SHA-256: ac800c4119fa93c6817e30a6e4223d3bec048595776b437342af79b4d1baa8a5
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=estimating+area+of+irregular+shapes+worksheet+ks2'. This URL is presented within the document body, disguised as a worksheet title, indicating a social engineering lure. The file also exhibits characteristics of a link farm, with numerous external links, many hosted on Shopify. The primary malicious URL is the most critical IOC.

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.club/wix?keyword=estimating+area+of+irregular+shapes+worksheet+ks2
    • https://cdn.shopify.com/s/files/1/0428/8475/9711/files/jubivisejezajiwimuxowa.pdf
    • https://cdn.shopify.com/s/files/1/0429/7703/4399/files/gmat_probability_questions.pdf
    • https://cdn.shopify.com/s/files/1/0433/2892/9945/files/sopuzeg.pdf
    • https://static.usrfiles.com/ugd/6116da_7281026e7b634825999550de0444203e.pdf
    • https://cdn.shopify.com/s/files/1/0466/7955/6261/files/38903207511.pdf
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/tarivusevukeluwif.pdf
    • https://cdn.shopify.com/s/files/1/0433/1349/6222/files/us_cfius_reform.pdf
    • https://cdn.shopify.com/s/files/1/0432/8466/0380/files/kareena_kapoor_picture.pdf
    • https://cdn.shopify.com/s/files/1/0429/5150/8131/files/resignation_letter_template_uk_nurse.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_off00007bdb.bin
d96c7b9cb8e79dddbcb1bd161a6e240c9b833c922b99fef84834739fe22337bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BDB 5560 bytes
font_01_sfnt_off00008eb0.bin
0fb2d6d86f799e34cf100e6dfd4b41adf37a5aeb50c347ec2c597f30dce6e820		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB0 10044 bytes

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