Malicious PDF — malware analysis report

Static analysis result for SHA-256 0736443dbac5d7fc…

MALICIOUS

PDF

46.8 KB Created: 2020-08-25 05:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d16e3880ae69eb5c779f43015656a653 SHA-1: 6127501b4ef46a796523697004e01bc8a1291bd4 SHA-256: 0736443dbac5d7fc3520c5b7329753f7725946d0fe800fad57a3ea25e2356eed
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious content. The primary redirector URL identified is https://ttraff.com/pify?keyword=m.+a+pass+2016+movie. While the document body contains seemingly innocuous text, the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful sites.

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/pify?keyword=m.+a+pass+2016+movie
    • http://files.seedsofhopela.org/uploads/1/3/1/4/131409755/nipoka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/4063/5042/files/castle_learning_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/3051/8679/files/tunabenuzumusupibeso.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/castillos_de_carton_almudena_grandes_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0436/0539/3571/files/ca_cpt_quantitative_aptitude_formulas.pdf
    • https://cdn.shopify.com/s/files/1/0434/7969/5517/files/garment_costing_sheet_format.pdf
    • https://cdn.shopify.com/s/files/1/0433/7916/3285/files/witulafanepudurifiradu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/62343563443.pdf
    • https://cdn.shopify.com/s/files/1/0429/3686/0839/files/87236196103.pdf
    • https://cdn.shopify.com/s/files/1/0464/2662/0056/files/small_sheet_metal_guillotine_for_sale.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1254/files/57284539075.pdf
    • https://cdn.shopify.com/s/files/1/0432/6440/9764/files/ahrq_guidelines_for_pressure_ulcers.pdf
    • https://cdn.shopify.com/s/files/1/0432/3747/4472/files/dobirubiripaxi.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062fd.bin
641b7b91e44f2f7ab286e3dc16492900ade5408ded396afaeda4bc99ddfe574e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62FD 5416 bytes
font_01_sfnt_off0000756a.bin
93b598569b8bffee5fda76d92e967edd98aeb4e7add3f92ba739a5e3c79f2198		 pdf-font-stream PDF embedded font (sfnt) at offset 0x756A 10560 bytes
font_02_sfnt_off000099be.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99BE 16092 bytes

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