Malicious PDF — malware analysis report

Static analysis result for SHA-256 887f85ad5168f381…

MALICIOUS

PDF

57.1 KB Created: 2020-08-30 19:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aaa8bfdb1eb09bb1e7c2ce8331ccb237 SHA-1: aa8d4b88ed6e44b0f0ac2fd1d5a88d718b4f4ee1 SHA-256: 887f85ad5168f381ff825dacaba625672185677ac7cf7d97f984dc82f1f38db7
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=zd30+workshop+manual+pdf'. This URL is presented within the document body, suggesting a social engineering lure to trick the user into clicking it. The PDF also contains a large number of external links, indicating a link farm strategy, and an ML classifier strongly flagged it as malicious. No scripts were extracted, but the primary attack vector appears to be the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=zd30+workshop+manual+pdf
    • https://static.usrfiles.com/ugd/a59130_96f06136f5024925889546c3ffb6534a.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb5652d359d247b2b909d39f0d8b242e.pdf
    • https://static.usrfiles.com/ugd/837d34_76d8537ac1cd4794b3f6d7c7fc49f7fc.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/2500_excel_vba_examples.pdf
    • https://cdn.shopify.com/s/files/1/0435/6577/7059/files/introduction_to_electrodynamics_4th_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0437/7470/5815/files/calocus_training_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/9281/9616/files/lixalujebi.pdf
    • https://cdn.shopify.com/s/files/1/0438/3516/2784/files/64635489225.pdf
    • https://static.usrfiles.com/ugd/b11f6d_5818fe12bc8941c980218d3db21a6d56.pdf
    • https://static.usrfiles.com/ugd/e4ff69_4d5be6faef4141ac936f931f4d6c7474.pdf
    • https://static.usrfiles.com/ugd/74e905_891c022f9d494b0596a90e5510351261.pdf
    • https://static.usrfiles.com/ugd/b8c837_43be3bc142ca4fbea274bbe945c4e436.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_off000099f4.bin
5972952e15add488edca91a4019180e11ea19aeb1c3db0fb28520baa9af2bdd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99F4 5700 bytes
font_01_sfnt_off0000ad44.bin
3ab04160adff650169fa6a4481d20401ed787cc2df905d0d9dea4caa601dd521		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD44 13340 bytes

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