Malicious PDF — malware analysis report

Static analysis result for SHA-256 837f454e12634025…

MALICIOUS

PDF

41.1 KB Created: 2020-08-08 21:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43387c135a838927cd73af7c34921ccf SHA-1: 54f8f76e0c37ad2a1faf9504a7d2101ffda96b28 SHA-256: 837f454e126340257b93eb2047b92245823849f84b85f8c8fe147cafb82eabed
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a malicious redirector link disguised as a link to a PDF about ethernet cabling. The link, https://ttraff.com/pify?keyword=ethernet+cabling+in+computer+networks+pdf, is designed to lead users to further malicious content. The document also exhibits characteristics of a link farm, with numerous embedded links pointing to various PDF files, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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/pify?keyword=ethernet+cabling+in+computer+networks+pdf
    • http://files.jilldfitness.com/uploads/1/3/1/4/131407057/zomex.pdf
    • http://wafudu.tidalmediasolutions.com/uploads/1/3/0/7/130776485/4525755.pdf
    • http://files.tcfrcn.org/uploads/1/3/0/7/130776268/9082015.pdf
    • http://files.myelegantweddinghk.com/uploads/1/3/2/8/132814742/c5435be.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1883/0503/files/desezofaxofuviwavifojubi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3905/5253/files/tixexiwelobov.pdf
    • https://cdn.shopify.com/s/files/1/0431/9186/1412/files/zunabem.pdf
    • https://cdn.shopify.com/s/files/1/0429/9715/3943/files/basic_english_grammar_tutorial_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6533/files/pamazikozovanuxivi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1551/1968/files/92463733176.pdf
    • https://cdn.shopify.com/s/files/1/0431/6194/4228/files/wanuvapa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8333/files/zazizuguzetomosenam.pdf
    • https://cdn.shopify.com/s/files/1/0430/9365/5716/files/13721848828.pdf
    • https://cdn.shopify.com/s/files/1/0431/6548/3172/files/vilos.pdf
    • https://cdn.shopify.com/s/files/1/0437/3918/5303/files/88517038449.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1296/files/business_process_management.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006018.bin
f8b10c4f535632a16c878a26acb7e1cc6c959ecc634005286853bfc3c6942d4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6018 5824 bytes
font_01_sfnt_off000073d1.bin
d9791fbf72a700e0e080b8c72ebe1d6503ccc5e5d655bdb53335bc7a299beea2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D1 10440 bytes

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