Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1f1d60f739b604…

MALICIOUS

PDF

44.2 KB Created: 2020-08-06 04:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2091fdca56f3774ba646b9cf17fb946a SHA-1: 0023ecf964ccbfe8f0601b5da15c008061366bd0 SHA-256: 4a1f1d60f739b604226bf0d22c4415d6c6253cdf19d9342532316e14b78394ea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links redirects through 'ttraff.ru', a known malicious redirector, to a URL containing 'the babylonian talmud pdf'. The ML classifier strongly flagged this PDF as malicious. The document's structure and link farm suggest an attempt to manipulate search engine results or lure users to malicious sites.

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=the+babylonian+talmud+pdf
    • http://files.westfielddentalpa.com/uploads/1/3/2/7/132741052/sesuxe.pdf
    • http://files.ultralightpaddling.com/uploads/1/3/2/6/132695566/9704346.pdf
    • http://files.globalmusicsong.com/uploads/1/3/1/8/131871593/c1519.pdf
    • http://files.sharonmcgregor.com/uploads/1/3/0/7/130740249/6630785.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3982/files/pavikaful.pdf
    • https://cdn.shopify.com/s/files/1/0434/5652/8541/files/zokafixafovi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3976/9254/files/68798626213.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/parisibudipaxetiwori.pdf
    • https://cdn.shopify.com/s/files/1/0435/2930/6263/files/94057686259.pdf
    • https://cdn.shopify.com/s/files/1/0437/4190/5050/files/you_ve_been_booed_sign.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefiwi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6590/9160/files/rabewobinuwesudimazu.pdf
    • https://cdn.shopify.com/s/files/1/0447/2664/8985/files/python___main__._py.pdf
    • https://cdn.shopify.com/s/files/1/0429/6212/4959/files/tawubifa.pdf
    • https://cdn.shopify.com/s/files/1/0437/2152/3349/files/lunenelemololakupesuluvi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0641/1431/files/bidokijenaremil.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4637/files/17159195276.pdf
    • https://cdn.shopify.com/s/files/1/0433/3325/5323/files/lemomekudorevevikub.pdf
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/68732941967.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_off00006e8c.bin
eb94862169243aa159a3e47afa030b68e2450f5d127a4917656bed31ceb23e4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8C 5196 bytes
font_01_sfnt_off0000801b.bin
67cde767d9a4885458f45e5592e6079ba8f2404482344587114ad8051311f8e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x801B 10460 bytes

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