Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa94ac2eaafa95b…

MALICIOUS

PDF

36.2 KB Created: 2020-08-06 10:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 309fba942b5de8110a29f465ffcc41c7 SHA-1: e17eeceb03480b38434c3f118e09add647dd8320 SHA-256: 2aa94ac2eaafa95b7c85119352108a30b9df33a1b252f896fc26f796213ce96e
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large external PDF link farm. The primary malicious URL identified is https://ttraff.ru/pify?keyword=barron+s+sat+math+2+pdf, which is likely used to redirect users to further malicious content. The document body contains obfuscated text and numerous URLs, many pointing to Shopify domains, but also several to potentially malicious domains. No scripts were extracted, limiting the analysis of direct execution capabilities.

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/pify?keyword=barron+s+sat+math+2+pdf
    • http://files.sd50dfl.net/uploads/1/3/1/4/131453198/8265784.pdf
    • http://files.ironmanjohn.com/uploads/1/3/2/3/132303189/gonififadenujiwe.pdf
    • http://files.texaslonestarrug.com/uploads/1/3/0/8/130814769/1821653.pdf
    • https://cdn.shopify.com/s/files/1/0427/8291/6767/files/zavadedaxatitaro.pdf
    • https://cdn.shopify.com/s/files/1/0433/7188/8803/files/juxizabomidomakedixiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/8722/4214/files/20862666865.pdf
    • https://cdn.shopify.com/s/files/1/0435/9805/3539/files/glossary_accounting_terms.pdf
    • https://cdn.shopify.com/s/files/1/0433/1791/9909/files/kudumogelaterezuwojajorut.pdf
    • https://cdn.shopify.com/s/files/1/0441/1287/1576/files/kigoxuvosenetakuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/samuloni.pdf
    • https://cdn.shopify.com/s/files/1/0428/4101/4438/files/3657876333.pdf
    • https://cdn.shopify.com/s/files/1/0437/3849/7185/files/70621415019.pdf
    • https://cdn.shopify.com/s/files/1/0429/9010/8833/files/42792705670.pdf
    • https://cdn.shopify.com/s/files/1/0434/4217/6150/files/wabojivimapasidedumo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5494/files/the_time_machine_penguin_readers_level_4.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pesaveput.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_off000050e3.bin
e592046a15366c384b971b53d7d01094cd6e1c9c881f54af47e1a1cd7c9793ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50E3 5428 bytes
font_01_sfnt_off00006336.bin
b1e3045242da401f1916d310b124ac36089a7913a678f21df62d20cd92716f5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6336 9644 bytes

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