Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c68454f63e6e72…

MALICIOUS

PDF

62.7 KB Created: 2020-10-14 03:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a6c93cdbd4cc32a5203d85aa7e93938e SHA-1: af24f1dab6b4a0547f2964958367981dc5eab6e6 SHA-256: a4c68454f63e6e725f20505ab24ee05d68bd94b49c89438814fd02235724a947
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL designed to lure users with a search query. The document body, though heavily obfuscated, contains the same malicious URL. The presence of multiple external links, many pointing to Shopify and Weebly domains, suggests an attempt to create a link farm for SEO poisoning or to host further malicious content.

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://cctraff.ru/strik?keyword=fisiopatolog%25C3%25ADa+de+la+leucemia+pdf In PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/tadib-pepalitegugoj.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/44d87feaf8ee.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/7989682.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/0cbd7f35736ab.pdfIn PDF document text
    • https://site-1036951.mozfiles.com/files/1036951/gunores.pdfIn PDF document text
    • https://site-1040513.mozfiles.com/files/1040513/18790807640.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7359/4039/files/apk_to_windows_phone_10.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9465/3595/files/fogaxaminebezake.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8857/9233/files/dunenikalolubaku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3110/8503/files/vulegokubepij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/0403/8815/files/a_raisin_in_the_sun_book_review.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB505 5388 bytes
SHA-256: d5a9cacbce50328eda7a1ced6d97f0352e0d7e4bb3fd633d082817b9b1499494
font_01_sfnt_off0000c753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC753 11228 bytes
SHA-256: 3acbbb711b9a17d52bb85c69e54d2fc3d3491848657dd320f1563e22233d2e9d

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