Malicious PDF — malware analysis report

Static analysis result for SHA-256 65cd2da79637435f…

MALICIOUS

PDF

42.2 KB Created: 2020-08-05 22:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d62c09ebe20446669c7b354f0a7fd365 SHA-1: 9bfafa3a074e99866a352a180f37c6d170b823fa SHA-256: 65cd2da79637435f091225349f79e49059ff40e249d01625e6f4512314cfafcd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The heuristic firings indicate this PDF is designed as a link farm, likely to manipulate search engine results or redirect users to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=contactor%20wiring%20diagram%20start%20stop%20pdf
    • http://files.essentialwellnessoasis.com/uploads/1/3/2/7/132711966/xemaserinumutav-lasivud.pdf
    • http://nevitet.simplyoursociety.com/uploads/1/3/2/7/132740900/futapibozuwa_foveju_gamowasunolet.pdf
    • http://files.davero.ca/uploads/1/3/1/4/131414134/genex_laditu_doviroxadek_rutujidovale.pdf
    • http://files.silvervalleyfarmsgooseeggs.com/uploads/1/3/1/4/131407465/08d8bc5ab7d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/3464/7460/files/gesagulixazabatakoxu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9547/3822/files/61730782529.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1573/files/16642513625.pdf
    • https://cdn.shopify.com/s/files/1/0430/8644/6746/files/lusefisisol.pdf
    • https://cdn.shopify.com/s/files/1/0438/8395/4328/files/80849562906.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9499/files/64262689320.pdf
    • https://cdn.shopify.com/s/files/1/0431/8704/4510/files/18466078830.pdf
    • https://cdn.shopify.com/s/files/1/0433/3201/0152/files/buxeveb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zeranosorijajigafa.pdf
    • https://cdn.shopify.com/s/files/1/0430/1396/3935/files/12190777075.pdf
    • https://cdn.shopify.com/s/files/1/0429/5560/4121/files/21226527878.pdf
    • https://cdn.shopify.com/s/files/1/0435/5820/7643/files/fulisijuzen.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059eb.bin
59a2d22109cb2e2289a1bcaec0f8f258241cf44f256713c8565f850f8cdc7eac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59EB 5228 bytes
font_01_sfnt_off00006ba2.bin
4245b595b0581fa31d306da88c642af435f09fac50f148f7787862f96862f7a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA2 9952 bytes
font_02_sfnt_off00008d9d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D9D 4324 bytes

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