Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b85595b4cff9047…

MALICIOUS

PDF

39.2 KB Created: 2020-08-08 01:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b099aa99b7bc973954969a5a95776f17 SHA-1: d9b551c626652761559abaace06e66c30cd2df6a SHA-256: 6b85595b4cff904700a05b39df9947ceb6a906500e6561b4e6e14c8cac93c559
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'telling the time worksheets' and the malicious URL itself, suggesting a lure to disguise the malicious intent. The presence of embedded URLs and the ML classifier's high confidence indicate malicious activity, likely an attempt to redirect users to a malicious site.

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.cc/wb?keyword=telling%20the%20time%20worksheets%20for%206%20year%20olds
    • http://files.drugaffectedchildren.com/uploads/1/3/1/0/131070204/5703115.pdf
    • http://semupu.alexandramcintoshlaw.com/uploads/1/3/2/6/132682646/jopuzodat.pdf
    • http://files.antoniatsaknaki.com/uploads/1/3/1/4/131482886/mazinu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4999/2870/files/bertrice_small_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/6621/3031/files/dadilovifajanalenosopil.pdf
    • https://cdn.shopify.com/s/files/1/0431/6105/9477/files/38615660973.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8628/files/92210512865.pdf
    • https://cdn.shopify.com/s/files/1/0438/7281/3211/files/vozawa.pdf
    • https://cdn.shopify.com/s/files/1/0427/6404/2396/files/kidofunuwukokelufovun.pdf
    • https://cdn.shopify.com/s/files/1/0434/7228/9944/files/92077592994.pdf
    • https://cdn.shopify.com/s/files/1/0428/6667/1782/files/dofilisidoruwedakojide.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/86018826657.pdf
    • https://cdn.shopify.com/s/files/1/0429/8250/6647/files/fijikuloluzavegewagumad.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52135332303.pdf
    • https://cdn.shopify.com/s/files/1/0430/1327/5811/files/rakaxogexewonuvuga.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4640/files/1388231036.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_off00005aea.bin
71ea19cab930afe3b141f29f15b7dc592650112ebe9f3a66c6508579f2392192		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AEA 5680 bytes
font_01_sfnt_off00006e29.bin
4b25c11c49de7eee7e2b5638ca7c00d378d00274c00557d0b83b6ec097f9f2b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E29 9872 bytes

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