Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9511e506da81521…

MALICIOUS

PDF

46.6 KB Created: 2020-08-24 04:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcb8b79b5db5320c662b5329b57a9b75 SHA-1: d59f6f06b0304d1e7e042a902723f46e5a31ea55 SHA-256: f9511e506da815217aa87220b1b9ce0eefdfcb775a047ec7af8b919d9ecef7d5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF links, suggesting a social engineering attempt to drive traffic to malicious sites.

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.cc/pify?keyword=arithmetic+number+series+questions+and+answers+pdf
    • http://files.3bsrange.com/uploads/1/3/0/7/130775858/zenaba-wegovuta.pdf
    • http://files.brewhoundsupplies.com/uploads/1/3/1/0/131069906/dogoposeje_fuzikamovuto.pdf
    • https://cdn.shopify.com/s/files/1/0438/9899/4856/files/63349835138.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6746/files/abbreviation_list_of_computer.pdf
    • https://cdn.shopify.com/s/files/1/0435/4909/8148/files/configuration_of_computer_system.pdf
    • https://cdn.shopify.com/s/files/1/0431/4018/6279/files/json_date-_time_format_example.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/29656347614.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tivaluzisezulumavolo.pdf
    • https://cdn.shopify.com/s/files/1/0437/2666/7925/files/95649347622.pdf
    • https://cdn.shopify.com/s/files/1/0436/7260/0729/files/73684443205.pdf
    • https://cdn.shopify.com/s/files/1/0432/1548/7135/files/samobuzelel.pdf
    • https://cdn.shopify.com/s/files/1/0433/8640/5029/files/annie_leonhart_titan_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/4605/0714/files/catecismo_de_la_iglesia_catolica_descargar_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0435/4516/5975/files/python_game_code_copy_and_paste.pdf
    • https://cdn.shopify.com/s/files/1/0437/0392/6939/files/mexodojubagi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6524/4832/files/nivaketivetogis.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_off00006262.bin
80a57515d867583d23239ed041ea0d39f2bd57b1c8dddadb36ee7744b9dfa88b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6262 5712 bytes
font_01_sfnt_off000075b6.bin
b1667a686ba65fb89aa357103dc388ebfdc3f6aad426a3a8d9ca4fe037900d8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75B6 10052 bytes
font_02_sfnt_off00009813.bin
c487aa01613208473e3c0b892de3260687b9c0341624d6c76d95d7849508583e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9813 16088 bytes

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