Malicious PDF — malware analysis report

Static analysis result for SHA-256 6443757bc3456771…

MALICIOUS

PDF

46.1 KB Created: 2020-08-14 11:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d13dd0637beff2866b442058c4c17a72 SHA-1: 05acb4080955f9b341e0c3131352e0d506cdad44 SHA-256: 6443757bc34567713bb21287409bd8d6d55606a2246a92d2f18e5eb3e7486d9b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection scheme. One of the primary links, 'https://ttraff.ru/wb?keyword=finding%20percents%20worksheet', is identified as a malicious redirector. The ML classifier strongly flagged this PDF, indicating malicious intent. The document body, though heavily obfuscated, contains the same suspicious URL and appears to be a lure for users to click on these links.

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=finding%20percents%20worksheet
    • http://xisufe.aerobicnewspaper.com/uploads/1/3/1/3/131384424/8803490.pdf
    • http://files.publishedbywestview.com/uploads/1/3/1/4/131482916/5292458.pdf
    • http://lemesozug.stnp2036.org/uploads/1/3/1/6/131637814/linafelu-sojevesijikuvo-luzukosopevo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4970/4854/files/ripuraz.pdf
    • https://cdn.shopify.com/s/files/1/0439/1007/0440/files/mopegave.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0694/files/jepiwavoludosositujopulol.pdf
    • https://cdn.shopify.com/s/files/1/0429/4639/6326/files/revukupawogu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7665/7057/files/xubenoragobuwa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6977/5782/files/alias_grace_novel.pdf
    • https://cdn.shopify.com/s/files/1/0438/1717/3149/files/nowor.pdf
    • https://cdn.shopify.com/s/files/1/0431/9897/2066/files/income_tax_act_1961_amended_upto_date.pdf
    • https://cdn.shopify.com/s/files/1/0441/0041/9736/files/81961196256.pdf
    • https://cdn.shopify.com/s/files/1/0431/5519/4011/files/45953495363.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1854/files/tb_meningitis_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0438/8651/0232/files/email_writing_samples_for_tcs.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_off00007769.bin
1a83807ddbef7d3bbd7ee6e16b3c859af8b9a07803841fffaa3299c08ffa48b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7769 5204 bytes
font_01_sfnt_off0000892d.bin
26b83709563732b43eb29858d9fc324781dd8e68629ab277b36b68995c7c1949		 pdf-font-stream PDF embedded font (sfnt) at offset 0x892D 10004 bytes

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