Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ddbf3faf88b03f…

MALICIOUS

PDF

45.7 KB Created: 2020-07-22 10:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6dcc7e6eae53829103f3b9fb40ce4be5 SHA-1: 454b2ee4eb13b1610839563b902342a31c146581 SHA-256: 15ddbf3faf88b03f3dd2cb05023a4693a21290275e460a4f00736a39ec750692
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to direct users to harmful content. The heuristic 'PDF_SEO_LINK_FARM' suggests a large number of outbound links, many hosted on Shopify, likely to obscure the malicious intent and improve search engine ranking for malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

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=nom%20tuberculosis%202019%20pdf
    • http://files.elsolpto.com/uploads/1/3/2/8/132814050/1695128.pdf
    • http://files.emilioparrilla.com/uploads/1/3/1/4/131453170/8866483.pdf
    • http://files.choicechildcarepreschool.com/uploads/1/3/2/6/132682936/b71bfd.pdf
    • http://files.poseidonplay.com/uploads/1/3/2/3/132302966/4604618.pdf
    • http://files.sharyndunn.com/uploads/1/3/1/1/131164023/5088819.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6265/6157/files/nabobekisetiziju.pdf
    • https://cdn.shopify.com/s/files/1/0436/6965/1606/files/kiwutejisisimazu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0752/files/11101844049.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zavoriduxosijalas.pdf
    • https://cdn.shopify.com/s/files/1/0434/4217/6150/files/ruragoxewebaxo.pdf
    • https://kanomotimela.files.wordpress.com/2020/07/dudadenesazanudekisabamo.pdf
    • https://nefenigagime.files.wordpress.com/2020/07/83442623735.pdf
    • https://pamivibafime.files.wordpress.com/2020/06/32474728075.pdf
    • https://zexivavazi.files.wordpress.com/2020/06/51918111697.pdf
    • https://cdn.shopify.com/s/files/1/0436/6244/2661/files/56403966153.pdf
    • https://cdn.shopify.com/s/files/1/0437/0549/9801/files/vujonixivuromifanun.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3287/files/75701230171.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/dikeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/9511/3374/files/zazisop.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1796/files/xoxanokizetutiti.pdf
    • https://cdn.shopify.com/s/files/1/0431/5450/5885/files/63302817388.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/suramedo.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_off000073b3.bin
c720c3957d4f9ba1b75cb9557e8a6dd7b58954b85956e73b2c3491ec1dc96558		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B3 5456 bytes
font_01_sfnt_off0000864e.bin
3bbb4eea8d7d839f46525c510b3cd5f2766eabe7feba30b452a5764d68f4103d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x864E 10148 bytes

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