Malicious PDF — malware analysis report

Static analysis result for SHA-256 af21d3ae37c74aec…

MALICIOUS

PDF

46.0 KB Created: 2020-07-18 06:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0876138e98c7ad54c0da01e9c30bc729 SHA-1: 2df3ce37c357ae665beede9ab215c70067066c65 SHA-256: af21d3ae37c74aec2fafde6a9093a180400b4f515565da1d443c12be1030693c
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to ttraff.com. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The document body, though heavily obfuscated, appears to be a lure related to 'challenges faced by female entrepreneurs in zimbabwe pdf', intended to trick users into clicking the malicious link.

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.com/wb?keyword=challenges%20faced%20by%20female%20entrepreneurs%20in%20zimbabwe%20pdf
    • http://files.paisanoperformance.com/uploads/1/3/1/3/131379833/solutosavofepiv-varilanuduj.pdf
    • http://files.imarsonline.com/uploads/1/3/1/3/131380413/6c76ebc2.pdf
    • http://files.shellfishermen.org/uploads/1/3/2/3/132302892/08350974b40b58.pdf
    • http://files.paisanoperformance.com/uploads/1/3/1/3/1
    • https://gubakuv.files.wordpress.com/2020/07/jepixadewi.pdf
    • https://fogojifoxuni.files.wordpress.com/2020/06/bofezubat.pdf
    • https://zigonafi.files.wordpress.com/2020/06/butumel.pdf
    • https://dutilexov.files.wordpress.com/2020/06/rulixewinevudopulomaxe.pdf
    • https://lirajobavan.files.wordpress.com/2020/07/23417211477.pdf
    • https://roxudozuneni.files.wordpress.com/2020/07/42877391657.pdf
    • https://xeferuf.files.wordpress.com/2020/06/zivubanuburowiluzonarusob.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sovir.pdf
    • https://cdn.shopify.com/s/files/1/0430/8258/0130/files/24102675747.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/kezotesiteribinizexewo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wudivilijekeroleve.pdf
    • https://cdn.shopify.com/s/files/1/0429/2476/9436/files/wufuxemenapabokuxuludijo.pdf
    • https://cdn.shopify.com/s/files/1/0438/3349/1606/files/97862714199.pdf
    • https://cdn.shopify.com/s/files/1/0431/8996/0861/files/62540532286.pdf
    • https://cdn.shopify.com/s/files/1/0433/4118/5189/files/39467323728.pdf
    • https://cdn.shopify.com/s/files/1/0435/5175/2344/files/nuxininis.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000748b.bin
7c88f7dc5d201b4535edbe8147e225bfb50ca2f2381d2bdef57e7fb6fbbccf68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x748B 5748 bytes
font_01_sfnt_off00008807.bin
83a43d01d69ff3af1dfe22c077f3fb0c45b61461b2e8679e55dda60de5cf7a04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8807 10080 bytes

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