Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac779a2a5ed72f64…

MALICIOUS

PDF

64.2 KB Created: 2020-08-14 22:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a11e1f47e8716e18518e74ebc3ebcb86 SHA-1: 813f96ccab9260af15a3dd5a14109d86728ac83f SHA-256: ac779a2a5ed72f64f67574a9ea68b57f95396aa53603f6be382fbe066d82494f
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and a query related to running macros in Google Sheets, suggesting a social engineering lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to potentially obscure the malicious redirector or for SEO poisoning. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=can+you+run+macros+in+google+sheets
    • http://jesefovis.artclasskb.com/uploads/1/3/2/7/132741024/natukireza_wabituganidive_buvoluwidemoke.pdf
    • http://files.smoketine.com/uploads/1/3/1/8/131859370/xepasojadigu.pdf
    • https://cdn.shopify.com/s/files/1/0436/3098/5376/files/60542961413.pdf
    • https://cdn.shopify.com/s/files/1/0429/2050/9596/files/5836901562.pdf
    • https://cdn.shopify.com/s/files/1/0438/7949/7896/files/best_simple_english_grammar_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/3186/3202/files/86040433955.pdf
    • https://cdn.shopify.com/s/files/1/0430/0685/3269/files/chean_engine_6._1.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/64989875230.pdf
    • https://cdn.shopify.com/s/files/1/0435/8150/5695/files/nelson_probability_and_statistics_1.pdf
    • https://cdn.shopify.com/s/files/1/0435/3854/6840/files/gemof.pdf
    • https://cdn.shopify.com/s/files/1/0432/5376/0162/files/medufurasulabozas.pdf
    • https://cdn.shopify.com/s/files/1/0432/1135/8369/files/defense_and_strategic_studies.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/58657968950.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000092a3.bin
bd5092c0e5d246484e2c3a967b9e76466668a36ee771a1db80962423e7ade5e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92A3 5220 bytes
font_01_sfnt_off0000a437.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA437 1800 bytes
font_02_sfnt_off0000acc5.bin
8309d237f935aa85182525b513fc12c64c4416b5ef5d5064d784f3e838dfcd60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACC5 14696 bytes
font_03_sfnt_off0000db72.bin
7635528afccc09bf4a05f3154308f34450054dc6dea789e61eafdb67c6c6129c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB72 17020 bytes

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