Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a7efedb86682ff…

MALICIOUS

PDF

42.2 KB Created: 2020-08-30 20:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac3bbeeaeca97cb29e35fdef73373e0f SHA-1: 03ea8c69ae1e9846a9f40d069a8ccdd2a7336fc8 SHA-256: c3a7efedb86682ff4f1934dced2fba86c3b1455453b2d2e0196f8970e2427405
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious due to a critical heuristic identifying a link to known malicious redirector infrastructure. The document body contains obfuscated text and embedded URLs, including the primary malicious redirector. The presence of numerous external PDF links, while many are benign, suggests a link farm or SEO poisoning attempt to distribute malicious content.

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=brandy+you%252527re+a+fine
    • https://static.usrfiles.com/ugd/b8c837_0695ef29efc44f7ea869ee39bc6ba955.pdf
    • https://static.usrfiles.com/ugd/bf650e_6a55bc0ef2c8445b881c3893a53458b7.pdf
    • https://static.usrfiles.com/ugd/ce14f3_879e65563bcd4c3e9868c6f6579e27b4.pdf
    • https://static.usrfiles.com/ugd/b8c837_87d4afba8bcf4aff8f54b9396dfdaab7.pdf
    • https://static.usrfiles.com/ugd/b65acf_68a5f574eeb74288a87fec0c993ad059.pdf
    • https://cdn.shopify.com/s/files/1/0437/9534/9661/files/dsm_personality_disorders.pdf
    • https://cdn.shopify.com/s/files/1/0430/1648/7065/files/zejopotuj.pdf
    • https://cdn.shopify.com/s/files/1/0436/6968/4377/files/98148527820.pdf
    • https://cdn.shopify.com/s/files/1/0438/2441/4882/files/introduction_to_environmental_engineering_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/4117/5190/files/extended_essay_guide_economics.pdf
    • https://cdn.shopify.com/s/files/1/0433/7650/9080/files/bizagi_modeler_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/5588/1119/files/manualidades_con_cajas_de_carton_de_leche.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1685/files/pressure_vessel_cost_estimation_spreadsheet.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_off00006865.bin
ee8c20fb61616a085f6d7ed0e768f79fe9218fe5ca262c2c3376fcb5e94f0859		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6865 4876 bytes
font_01_sfnt_off00007918.bin
c0cc5cdd0d3f8fcf96c22b36f0d78b77aacf3b9dc9547342945bc9d855c918bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7918 10256 bytes

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