Malicious PDF — malware analysis report

Static analysis result for SHA-256 1955a4ccd18ce093…

MALICIOUS

PDF

38.4 KB Created: 2020-08-26 14:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bf8be7a33024e012f8b108f89c83b11 SHA-1: 3b07ffb7e5f7e9498c6f2e43b688f27e7cd0de41 SHA-256: 1955a4ccd18ce093312471f336a2c6269fe0d484c2f8197ddc99f390dea89a73
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 a redirector service designed to obscure the final destination. The primary heuristic indicates that the PDF links to known malicious redirector infrastructure. While no scripts were extracted, the structure suggests an attempt to lead users to potentially malicious content through a link farm.

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/pify?keyword=interval+notation+worksheet+algebra+1
    • http://files.divorcecoachingandconsulting.com/uploads/1/3/0/8/130874518/bejam-soselovorifat-tekumubobup-powidonuvewadar.pdf
    • http://xazidelug.preppantherplace.com/uploads/1/3/2/3/132302868/1542293.pdf
    • http://pogediw.tamara-vasquez.com/uploads/1/3/0/7/130776089/3befbb40ebea59.pdf
    • http://gobekajo.christinabhoward.org/uploads/1/3/0/8/130814328/bogexekowelojiw.pdf
    • http://wozir.nomadsadventurequest.com/uploads/1/3/0/7/130775726/9193639.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41448402009.pdf
    • https://cdn.shopify.com/s/files/1/0433/2499/7800/files/palijogisenuzejovuveb.pdf
    • https://cdn.shopify.com/s/files/1/0438/2585/6669/files/future_maker_products_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/6277/1366/files/36246988147.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kilezibuvi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5848/6678/files/97542919928.pdf
    • https://cdn.shopify.com/s/files/1/0429/3676/2527/files/30810774135.pdf
    • https://cdn.shopify.com/s/files/1/0428/0877/0726/files/solving_equations_worksheet_gcse_higher.pdf
    • https://cdn.shopify.com/s/files/1/0431/7868/8663/files/wifumoxawiganewe.pdf
    • https://cdn.shopify.com/s/files/1/0432/5795/4467/files/tuximabipi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1149/files/bekasidofak.pdf
    • https://cdn.shopify.com/s/files/1/0430/8982/1845/files/xulizibipolu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9438/3522/files/que_es_una_cadena_alimentaria.pdf
    • https://cdn.shopify.com/s/files/1/0431/6141/9927/files/30555835327.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_off0000527d.bin
5b6d1cc3d7a356e1074523fd7e6ec885e67cad4176c58ce9768064b3ddd66705		 pdf-font-stream PDF embedded font (sfnt) at offset 0x527D 5292 bytes
font_01_sfnt_off0000648c.bin
0296b45827c7cb9eb6ad8fff732bbbc362b9595c7cc4b88ca27fb7b52811041d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x648C 12312 bytes

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