Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e17f288b7f0d11…

MALICIOUS

PDF

42.7 KB Created: 2020-08-14 04:41:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ae7985925367e015ae4731ae3c0a53a SHA-1: 5c2df4fd2561ddcdcf1cd1310eb81b6954f32648 SHA-256: 13e17f288b7f0d11d0c1b8adf82bf832bbd18f8af09999ed6b769b5729e52923
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector link farm. The primary malicious URL, 'https://ttraff.ru/wb?keyword=dental%20instruments%20names%20and%20pictures%20pdf', is flagged as a redirector. The document body, though heavily obfuscated, contains references to the same URL and appears to be generated by wkhtmltopdf, suggesting an automated process for creating SEO spam or phishing lures.

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/wb?keyword=dental%20instruments%20names%20and%20pictures%20pdf
    • http://faweweni.eusebiachurch.com/uploads/1/3/1/4/131437792/c047fa47.pdf
    • http://files.waggawaggaprobus.waggamatters.com/uploads/1/3/2/6/132683330/zigebegadub_sovezufudi.pdf
    • http://files.compasswellnesscoaching.com/uploads/1/3/0/8/130874543/1997618.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/6148/6503/files/rexevon.pdf
    • https://cdn.shopify.com/s/files/1/0433/3866/2053/files/16393652430.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/25967616736.pdf
    • https://cdn.shopify.com/s/files/1/0428/9586/8067/files/9558822688.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/74177619547.pdf
    • https://cdn.shopify.com/s/files/1/0448/3697/8850/files/tanatologia_medico_forense.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/elemento_quimico_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0438/8962/3208/files/29490002609.pdf
    • https://cdn.shopify.com/s/files/1/0431/5791/3754/files/8856256346.pdf
    • https://cdn.shopify.com/s/files/1/0454/7497/1798/files/rational_functions_and_asymptotes.pdf
    • https://cdn.shopify.com/s/files/1/0436/5287/4390/files/the_natural_history_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/8468/5220/files/country_code_222.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006776.bin
7ab64287ada6b3b62ebf8eff70405125d3f58cd4f29cb9a87d316b19b7ce722d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6776 5300 bytes
font_01_sfnt_off00007961.bin
f78c64cc2d7b0a172a36d9641b945a5b19dd6a414795e7076e94875e1c137c42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7961 11072 bytes

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