Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40b8bc0b7a03f35…

MALICIOUS

PDF

39.2 KB Created: 2020-08-31 09:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: feb929abb4aa34250045522f99da5463 SHA-1: 1766780a4abf542fd7b26605279d534f22d124e5 SHA-256: a40b8bc0b7a03f354656454fd7db202dc6ecab01576146c5cc13cefc513d6bde
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.ru/wix?keyword=reheating+a+chicken+pot+pie'. This indicates an attempt to lure the user to a potentially harmful site. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, suggesting a broader campaign for traffic generation or distribution. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector is sufficient evidence for this assessment.

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=reheating+a+chicken+pot+pie
    • https://static.usrfiles.com/ugd/764aaa_c67dad8ae62e4234a37c6423234adac1.pdf
    • https://static.usrfiles.com/ugd/b8c837_a3fa0ae77c684d6c86a0dba9d025c331.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a6ee4b485994e83a8f61d18f6b92ae3.pdf
    • https://static.usrfiles.com/ugd/60933b_af2c3f8cd95c4a979a51830a9db2b510.pdf
    • https://static.usrfiles.com/ugd/3dd68e_cd9b4a53f6e741eb8584052037230383.pdf
    • https://cdn.shopify.com/s/files/1/0435/9212/2527/files/computer_problem_statement.pdf
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/xugubux.pdf
    • https://static.usrfiles.com/ugd/b8c837_103e10f461a34d39b8cb87ee53655667.pdf
    • https://static.usrfiles.com/ugd/2813e2_5a00c9c04131488793aaf18cfefefda8.pdf
    • https://static.usrfiles.com/ugd/b8c837_579b2d69560a44cb9ac5659624830d5e.pdf
    • https://static.usrfiles.com/ugd/aef5b7_259d95c01f9a4b74bfc947c439395a35.pdf
    • https://static.usrfiles.com/ugd/b8c837_1318525437d04026a36bb8fd533469f4.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_off00005d83.bin
4893514446195b3bbfc664fc2364ce00d2381157adbd7ae480a234a19ae1494d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D83 4960 bytes
font_01_sfnt_off00006e63.bin
615fa75fa61fa073fb2acf7db700a78926100b906664c6431608095b6d4a915e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E63 10068 bytes

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