Malicious PDF — malware analysis report

Static analysis result for SHA-256 edfb7149b2b4ed03…

MALICIOUS

PDF

41.8 KB Created: 2020-08-03 17:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8ba89fc6df37f44c06175bb08508676 SHA-1: 4c9c093138773da3352afed8ae7350c982fe96a8 SHA-256: edfb7149b2b4ed0332d034491b23c6374833a3f69ba8064c0805600aae5167af
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many pointing to Shopify domains, which is indicative of a link farm designed for SEO manipulation. One of the primary links, 'https://ttraff.ru/wb?keyword=helping%20verb%20worksheets%20grade%204', is flagged as a malicious redirector. The ML classifier strongly supports the malicious verdict. The document body, though heavily obfuscated, contains references to educational content, likely a lure to encourage clicks on the malicious 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=helping%20verb%20worksheets%20grade%204
    • http://files.gallantacademy.com/uploads/1/3/1/4/131438330/981531.pdf
    • http://files.jenniferbiedermannjewelry.com/uploads/1/3/1/8/131871633/xaramudus.pdf
    • http://files.stjohnthebaptistschoolalumni.com/uploads/1/3/2/6/132696048/zereparebi_kakepevido.pdf
    • http://files.apollobatonrouge.com/uploads/1/3/1/4/131454355/750ac2.pdf
    • http://files.danburydentist.us/uploads/1/3/2/8/132815872/xinefozi-vefevedag-juviwuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2675/files/koxabitisurobaleruded.pdf
    • https://cdn.shopify.com/s/files/1/0432/2341/6987/files/bexaridejapazewopisawe.pdf
    • https://cdn.shopify.com/s/files/1/0429/7719/8229/files/89801917544.pdf
    • https://cdn.shopify.com/s/files/1/0439/0024/0024/files/kideruxopenimuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/7372/3800/files/lesiwiseguxutama.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24810932871.pdf
    • https://cdn.shopify.com/s/files/1/0429/5373/6351/files/tujapopinogegebo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1239/9009/files/botepujabana.pdf
    • https://cdn.shopify.com/s/files/1/0438/6163/9318/files/43416666450.pdf
    • https://cdn.shopify.com/s/files/1/0436/0781/8398/files/44310935903.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6105/files/ratudaponitur.pdf
    • https://cdn.shopify.com/s/files/1/0437/2217/8710/files/pozegaxilakibisera.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1764/files/29508119601.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_off00006374.bin
8cbce4cf15a8c1bb7e4bb7492f0da16cd06c651058d84e896bea43b93504ae8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6374 5624 bytes
font_01_sfnt_off000076aa.bin
309f29bfc3c9ab97c8896913079161cb66aeb731ba5973aa4f24b8b2e933a6e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76AA 10536 bytes

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