Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc774c924cd6940…

MALICIOUS

PDF

38.0 KB Created: 2020-08-29 06:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2129a9c924c6c9d90a181373d6276ff7 SHA-1: 31307b353444c8ba4fbe431a3fdaf0670088cd80 SHA-256: 5bc774c924cd69401edfce29dce76afbc20e7bea4eb403940dd186cc61fa5ab8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.ru/wix?keyword=father+tadros+malaty'. It also exhibits a PDF link farm heuristic, with 19 external PDF links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the primary malicious URL.

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/wix?keyword=father+tadros+malaty
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/5330/8314/files/kopoxodoxexujozurijifi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rodol.pdf
    • https://cdn.shopify.com/s/files/1/0435/7806/5059/files/ziwotujagunotegasajowafu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1810/0637/files/search_pdf_file_on_ipad.pdf
    • https://cdn.shopify.com/s/files/1/0431/6794/0765/files/rokopemejomefuvifojokeko.pdf
    • https://cdn.shopify.com/s/files/1/0435/8320/9631/files/row_canonical_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/9657/8975/files/stock_market_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0430/0632/8995/files/82011867121.pdf
    • https://cdn.shopify.com/s/files/1/0432/5441/5515/files/muwijamemorefiduwikiwisa.pdf
    • https://cdn.shopify.com/s/files/1/0435/6099/2927/files/3191776784.pdf
    • https://cdn.shopify.com/s/files/1/0449/9764/0360/files/95803702354.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/annabac_franais_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/0475/5096/files/benares_michelin_starred_cooking.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66689816557.pdf
    • https://static.usrfiles.com/ugd/b8c837_da81ffc69bf14d968c624e05886684c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_508655159a0645a7909732b7f5967ee4.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb8832ae30a74c23af99b700dc1bf57d.pdf
    • https://static.usrfiles.com/ugd/b8c837_3583a24750774a0a90537facee6b04d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_614751c2c7a24e25bbcebab14ffa3923.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_off000055fc.bin
45bdadf53ef818bce7e90b47815a3fbe965c685c0ac57293486c515458112957		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55FC 5124 bytes
font_01_sfnt_off00006748.bin
7c8df24070c05e3697b9b53ef9f0281f8785d2b824e3cb24775e18a0477fd9e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6748 10528 bytes

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