Malicious PDF — malware analysis report

Static analysis result for SHA-256 c650c2ac2c5dbf73…

MALICIOUS

PDF

37.0 KB Created: 2020-08-31 10:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 484ac37dad3b7a3609ab6e448adacecc SHA-1: 5289e5ad822750d337d968733cb17ee00bd9d464 SHA-256: c650c2ac2c5dbf737c8442d090769b20bf0d505356c233b09b54258d084656c9
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=cbse+class+12+physics+investigatory'. This indicates the document's primary purpose is to redirect users to a potentially harmful site. The file also exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign but serve to obscure the malicious one. No scripts were extracted, and the document body is heavily obfuscated, making it difficult to determine the exact nature of the final payload.

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=cbse+class+12+physics+investigatory
    • https://static.usrfiles.com/ugd/b8c837_be725b04f8374713a6fbbbd2c570ee6a.pdf
    • https://static.usrfiles.com/ugd/b8c837_30c2c394a7de43c1b808a586a801eb80.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f3315c5e7464f1bb0f3d6fda657370a.pdf
    • https://static.usrfiles.com/ugd/4bb894_c2c44d95a8184f0ea94c36dfe6991883.pdf
    • https://cdn.shopify.com/s/files/1/0428/7794/3967/files/bipolar_disorder_screening.pdf
    • https://cdn.shopify.com/s/files/1/0437/1791/8870/files/use_of_a_an_the_in_english_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0432/0657/4238/files/36901988423.pdf
    • https://cdn.shopify.com/s/files/1/0437/1388/8405/files/minecraft_shield_enchantments.pdf
    • https://cdn.shopify.com/s/files/1/0429/9807/1449/files/90038526370.pdf
    • https://static.usrfiles.com/ugd/8a419d_9545b057f8cc4061b4d5d43141b3da44.pdf
    • https://static.usrfiles.com/ugd/b8c837_984aba8673e94f28b01643f7eb643778.pdf
    • https://static.usrfiles.com/ugd/0aab01_1182739d0b7f4c8aa52d96f5dc8c1bc7.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_off00005162.bin
868ce59a02cee201b9df73155373303d0163ee5f166df9d5376af272010e8b11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5162 5588 bytes
font_01_sfnt_off00006460.bin
4455edf7ec0a0c1926803d7ab2eb62f0817926eef5c1906f8eb7bc36423446c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6460 10276 bytes

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