Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca6a4fa3dd0cd74…

MALICIOUS

PDF

57.1 KB Created: 2020-09-02 00:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1514665dd27e27a62b121479e429c9c5 SHA-1: 3c22ee24c31b042090d6df111c6eaa2c73c4b722 SHA-256: eca6a4fa3dd0cd74e49ee614103bc82f2d35af11e5a286ebbc13dcdfa6528788
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'antonio gramsci books pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The presence of a malicious redirector link indicates an attempt to lead the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=antonio+gramsci+books+pdf
    • https://cdn.shopify.com/s/files/1/0431/5221/2130/files/teoria_funcionalista_del_delito.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2894/files/53061927447.pdf
    • https://cdn.shopify.com/s/files/1/0429/6248/5407/files/91289773101.pdf
    • https://static.usrfiles.com/ugd/6cf804_7962d6360c5b4448a9fa0fba1bef33b4.pdf
    • https://static.usrfiles.com/ugd/32777b_3650ff3de6b74abf978b10f1f2b6bb7a.pdf
    • https://static.usrfiles.com/ugd/ac51ce_80ec0f604fa340a6b5d90a48764c6632.pdf
    • https://static.usrfiles.com/ugd/52b593_bc94b1923dae47739a356b037943ca0e.pdf
    • https://static.usrfiles.com/ugd/3ce946_d8359241d813496387ec69adae42c89b.pdf
    • https://static.usrfiles.com/ugd/b8c837_550b66e1cead48ff8e3451b63a69ed27.pdf
    • https://static.usrfiles.com/ugd/b8c837_3be500aae3ec4f30908e389f6d583f57.pdf
    • https://static.usrfiles.com/ugd/2486b5_61b21678470c43eb8f5b4cefd57b0d7a.pdf
    • https://static.usrfiles.com/ugd/01e791_974e7687c4844a218fe1bb6404a1c7a7.pdf
    • https://static.usrfiles.com/ugd/13ae68_e99ccfd02a6f41009226f3f312e6ed24.pdf
    • https://cdn.shopify.com/s/files/1/0440/4543/5030/files/python_sqrt_function.pdf
    • https://cdn.shopify.com/s/files/1/0435/5827/3183/files/tipos_de_canaletas_para_cableado_estructurado.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005847.bin
0a894534fdc43dbb9acbfe07c98346dc7a43424408799d163e4420b6e7bdc93d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5847 5308 bytes
font_01_sfnt_off00006a2e.bin
9e70a9e3c17d1c42ffc0bfd7ee5af12e591989bf189a0e267b6187572ffdb365		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A2E 6264 bytes
font_02_sfnt_off00007ed6.bin
3f112161b4f8e234cca815693a921cdd10f1109db08ee0dda2e9728f4ba8f896		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED6 11720 bytes
font_03_sfnt_off0000a691.bin
6d836db182deb3fcd7b4aa657f57e4602b5324cd30653ca3d389d6b7b31c2fb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA691 20872 bytes
font_04_sfnt_off0000c88f.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC88F 4324 bytes

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