Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ab9d08bb2b33fa…

MALICIOUS

PDF

42.5 KB Created: 2020-07-23 12:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 081f0d90bf7d8a5b27d5605d55fb7459 SHA-1: b07293c35f9a47b89f115f6d875b731a9fc3da36 SHA-256: b6ab9d08bb2b33fa4ffa36fa035aba43321fff966199c2104410c351fe6191bd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.ru. This indicates the document's primary purpose is to lure users to a potentially harmful site. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external links, many of which are hosted on cdn.shopify.com, suggesting an attempt to game search engine results or distribute malicious content through seemingly benign platforms. The ML classifier also strongly flagged this PDF as malicious.

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/wb?keyword=roles%20and%20responsibilities%20of%20panchayat%20secretary%20pdf%20in%20tamil%20nadu
    • http://files.jasmafusioncuisine.com/uploads/1/3/1/3/131381722/9254902.pdf
    • http://files.pentictonscottishfestival.ca/uploads/1/3/2/7/132740533/sesarejunuporul_xezeb.pdf
    • http://files.horizonelementarypta.org/uploads/1/3/1/3/131398164/wazupud_dapujagovulizi_mebixafazedat_jogikokese.pdf
    • http://files.hudsonvalleygarlicgrowers.com/uploads/1/3/2/6/132695679/afeee.pdf
    • https://cdn.shopify.com/s/files/1/0428/6011/8175/files/74434504188.pdf
    • https://cdn.shopify.com/s/files/1/0439/3913/5643/files/zepivutomakeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62386903812.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/70256753340.pdf
    • https://cdn.shopify.com/s/files/1/0433/2909/3784/files/zerodur.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zixetirubopejama.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6216/files/tirajugepufeger.pdf
    • https://cdn.shopify.com/s/files/1/0428/4855/1068/files/49578294664.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8532/files/marozub.pdf
    • https://cdn.shopify.com/s/files/1/0428/5127/0815/files/20402318536.pdf
    • https://cdn.shopify.com/s/files/1/0431/9536/7584/files/gazajikolapesopovogato.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5893/files/98042053922.pdf
    • https://cdn.shopify.com/s/files/1/0435/2219/5608/files/40908194451.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9996/files/zixidonik.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_off00006814.bin
9851ba2112a842bf2e37780a169b887a5e80f16b9d2e98532a0796fbf8224db0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6814 5524 bytes
font_01_sfnt_off00007aab.bin
137d7241e70929c4425c2b529e87844b03e488a46eec4a05a9c31b24bf5682bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AAB 9784 bytes

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