Malicious PDF — malware analysis report

Static analysis result for SHA-256 916eee1d9faecb0b…

MALICIOUS

PDF

43.5 KB Created: 2020-08-20 13:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eef124e920400cc90e80e10d8291ba28 SHA-1: 9e0e92917381baafb16d9b2b8e94c7e4a080239f SHA-256: 916eee1d9faecb0b41ccba918cfcf34706facd9c32579c147b81fce6b179c26e
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=formele+brief+schrijven+nederlands'. The document body also contains this URL and other links pointing to various PDF files, suggesting a link farm or SEO poisoning attempt. The ML classifier also flagged this PDF as malicious with high confidence.

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.com/pify?keyword=formele+brief+schrijven+nederlands
    • http://junawez.stjca.org/uploads/1/3/0/8/130874575/6074476.pdf
    • http://files.texxinternational.com/uploads/1/3/1/3/131381363/zafif.pdf
    • http://files.thevillagepets.net/uploads/1/3/1/0/131070845/034b6.pdf
    • http://files.jamesoakleyhumanist.org/uploads/1/3/2/3/132303061/06479e2557db14.pdf
    • https://cdn.shopify.com/s/files/1/0439/3687/4651/files/arsenal_vs_man_utd_tv_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/2991/4012/files/sample_letter_of_intent_to_buy_property.pdf
    • https://cdn.shopify.com/s/files/1/0430/8844/5604/files/57570281626.pdf
    • https://cdn.shopify.com/s/files/1/0435/1151/3252/files/ielts_answer_sheet_listening_and_reading.pdf
    • https://cdn.shopify.com/s/files/1/0463/4869/7757/files/capex_budget_excel_template.pdf
    • https://cdn.shopify.com/s/files/1/0456/4162/9863/files/ecological_footprint_definition.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gabagijujusudizal.pdf
    • https://cdn.shopify.com/s/files/1/0436/5837/9417/files/catalogo_de_price_shoes_urbano_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/4952/5156/files/27661169978.pdf
    • https://cdn.shopify.com/s/files/1/0439/0364/7912/files/fnaf_4_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/4431/5029/files/79722652057.pdf
    • https://cdn.shopify.com/s/files/1/0432/8059/7152/files/creative_writing_grade_11_module.pdf
    • https://cdn.shopify.com/s/files/1/0428/3564/0487/files/calisthenics_diet_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069ff.bin
7293f8748841fc38c82ecbb7d74886991c23d9c0b0be469781ce2c9ec734a9f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69FF 5492 bytes
font_01_sfnt_off00007c88.bin
28cf868fd889e9fa0186a9f6cece790b17e9d878e6ab1dc62d90fc74acf6af05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C88 10852 bytes

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