Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f9420e747959ff…

MALICIOUS

PDF

40.9 KB Created: 2020-08-29 13:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 217d7bcbd2b9bb2103152749ec88c287 SHA-1: a5d3094cd3d512e0b2dbe8bf30dc92b0ed6c3c13 SHA-256: 82f9420e747959ff4a7692afba0bc62b409d47afa619208effe0f65490bd3940
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector at 'ttraff.com'. The PDF also features a link farm of numerous PDFs hosted on Shopify, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious redirection or phishing.

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/wix?keyword=zoologia+dos+invertebrados+barnes+7
    • https://cdn.shopify.com/s/files/1/0434/0216/6428/files/vexididigitikurizer.pdf
    • https://cdn.shopify.com/s/files/1/0434/1409/3986/files/mathematical_statistics_with_applications_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0435/4624/7332/files/berude.pdf
    • https://cdn.shopify.com/s/files/1/0430/1520/9123/files/30193917626.pdf
    • https://cdn.shopify.com/s/files/1/0429/1536/5031/files/jelakulabugogave.pdf
    • https://static.usrfiles.com/ugd/b8c837_d9acda9ffa934ff98a9452f81e46c4aa.pdf
    • https://static.usrfiles.com/ugd/3aca14_69eda0a6fbb8435ea2d7a6c31c33b419.pdf
    • https://static.usrfiles.com/ugd/b8c837_0eee8817603b43f3842ed2d6e4851cdc.pdf
    • https://static.usrfiles.com/ugd/b8c837_0855aecdad9f4b0aa0a1147d93c609aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_e7dec993685842a59996048e02d31b77.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_off000061dd.bin
9654b5a965e18aa7424a1504a54ad6d043058f3819f8ac12e712848b70413b22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61DD 5228 bytes
font_01_sfnt_off000073c5.bin
2aabec0de753f3ef629805f384b30d58dc1630645662400aaa9bb76891eecad6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C5 10852 bytes

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