Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7230aaf9a068b6…

MALICIOUS

PDF

40.4 KB Created: 2020-08-31 07:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5cb474faacd0956278f8374655c0c44f SHA-1: 82b5e3bdb5c16f165da4be3c9cb1949bb37bb13c SHA-256: ca7230aaf9a068b6d5c931a2a52cf54ddcc444cea3c93238fa62ca9bb66537e3
120 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.ru, which is disguised with keywords related to educational worksheets. The file also exhibits characteristics of a link farm, with numerous embedded URLs pointing to static.usrfiles.com. The primary malicious intent appears to be directing users to the ttraff.ru domain, likely as a step in a phishing or malware distribution chain.

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=root+words+with+prefixes+and+suffixes+worksheets
    • https://static.usrfiles.com/ugd/d216cb_6dfceecdd5e74baabd9fac7e8fce3353.pdf
    • https://static.usrfiles.com/ugd/913720_455a56ef85e84ce491642872d68a40ac.pdf
    • https://static.usrfiles.com/ugd/63022f_18733442e73c4cb0898ff18c62504ff4.pdf
    • https://static.usrfiles.com/ugd/f459ea_a3cef52dd3c845fbafaf604db0049cdc.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6a87fb6912d40de9e8e8e6d477cc261.pdf
    • https://static.usrfiles.com/ugd/b8c837_56832bff5e0b4c5982dfa82bff44cd28.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6daeec956dc4b1891dab3b63d0089a3.pdf
    • https://cdn.shopify.com/s/files/1/0430/1520/9123/files/delta_bench_band_saw.pdf
    • https://cdn.shopify.com/s/files/1/0440/7227/2037/files/bepomoravawuxegulafipes.pdf
    • https://cdn.shopify.com/s/files/1/0433/4649/3605/files/72209535921.pdf
    • https://cdn.shopify.com/s/files/1/0435/3854/6840/files/siluwikewazekes.pdf
    • https://cdn.shopify.com/s/files/1/0436/2695/4905/files/adams_tax_form_helper_online.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1c45884a71143b18055d956689e6f83.pdf
    • https://static.usrfiles.com/ugd/b8c837_3287f6c608f146e5b9d64f30e8c8d0a0.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_off00005fcd.bin
1e23397c202f17a51d34082ba626d0d7201ed86a70928f892c8a88c3dc9ad8d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCD 5328 bytes
font_01_sfnt_off00007206.bin
67dc08ac980bc495f8d077ff07b56f0641fbbbd71f8a9e621f880c1f66eb26f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7206 10224 bytes

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