Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d4256c8db1b181…

MALICIOUS

PDF

43.8 KB Created: 2020-08-11 21:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dad480854ca2d5c59235ff5caa1a49f4 SHA-1: 606b329479effa2f2be38356302e55ceccf7b9dc SHA-256: c6d4256c8db1b181c1b1ae14261fcb3ceca430ed27ee3f46f0225309722330d8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. This suggests a link farm or SEO poisoning tactic to drive traffic to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector 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/pify?keyword=encyclopedia+of+computer+science+ralston+pdf
    • http://sobogirof.afriendlybread.com/uploads/1/3/1/4/131437130/jokuvo.pdf
    • http://tunatet.tilliesschoolofperformingarts.com/uploads/1/3/2/3/132303382/vuguxozinipe.pdf
    • http://files.unityofpalmyra.org/uploads/1/3/0/7/130775827/0d2098eedc2.pdf
    • http://files.beachtownrattan.com/uploads/1/3/1/4/131406068/6621901.pdf
    • https://cdn.shopify.com/s/files/1/0440/5601/9109/files/xonujutunadetelisozazug.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/64873280060.pdf
    • https://cdn.shopify.com/s/files/1/0440/6303/1448/files/pdf_splitter_merger_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/6180/4197/files/8139130880.pdf
    • https://cdn.shopify.com/s/files/1/0435/9330/2178/files/12665074970.pdf
    • https://cdn.shopify.com/s/files/1/0433/8139/1514/files/sirit.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/bifobaduwu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8937/1029/files/27655381112.pdf
    • https://cdn.shopify.com/s/files/1/0431/3278/0695/files/99609887005.pdf
    • https://cdn.shopify.com/s/files/1/0432/3701/5719/files/fefokovarefebagar.pdf
    • https://cdn.shopify.com/s/files/1/0434/4876/2529/files/mechanism_of_oxidative_stress_pdf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e6f.bin
45420264fad98cf267bb0cfc8a250203e11e7c3412832f4a2370e0f30ffd25f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E6F 5240 bytes
font_01_sfnt_off0000702b.bin
d8af9d7a7648c8f066d5cc6f60cba5aa6aa8a7071cfdc5cff8f0a600b4452f80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x702B 10756 bytes
font_02_sfnt_off000093fd.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93FD 4324 bytes

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