Malicious PDF — malware analysis report

Static analysis result for SHA-256 8921d743b045727b…

MALICIOUS

PDF

72.0 KB Created: 2020-08-31 17:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f7a3e128b410dff7d5b67b2675e275a SHA-1: 0be51f6205e011eb94757ebf20f4b00de08f1425 SHA-256: 8921d743b045727be4565ccf4793800f28f35a136d7cabf549dbf53188e67d69
154 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, embedding numerous external links, with at least one identified as a redirector to malicious infrastructure. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious sites, potentially for further exploitation or phishing.

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/wix?keyword=vasculogenesis+and+angiogenesis+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_56f9e3dc007b4eee92cd0441266ca5ea.pdf
    • https://static.usrfiles.com/ugd/5ad03d_1dfecc1ea3ed4237984d895a200b7f29.pdf
    • https://static.usrfiles.com/ugd/b8c837_1bb815f7052643ddb9520f07d89f548e.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b0552f6909d4ddd9549ca0bf470489b.pdf
    • https://cdn.shopify.com/s/files/1/0437/4495/2471/files/62982282980.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/72715279846.pdf
    • https://cdn.shopify.com/s/files/1/0430/1006/4537/files/zibulufobezotoxemederes.pdf
    • https://cdn.shopify.com/s/files/1/0432/2800/4507/files/64096995751.pdf
    • https://cdn.shopify.com/s/files/1/0438/2097/4242/files/58382261836.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/56495093240.pdf
    • https://cdn.shopify.com/s/files/1/0431/0564/8801/files/kewivaxekarivokikirigawib.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/mibofabajukasota.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52209678420.pdf
    • https://cdn.shopify.com/s/files/1/0432/0883/5234/files/calendar_2020_to_print.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_off0000d03d.bin
11336623ff68e49a32588e2b77481d7bdb7de8220240489ab6964b0fc7c02412
pdf-font-stream PDF embedded font (sfnt) at offset 0xD03D 5192 bytes
font_01_sfnt_off0000e204.bin
a5fa57714876d683da3fc2458fe73130d07a79dbe35da513cdfbfb1363280939
pdf-font-stream PDF embedded font (sfnt) at offset 0xE204 15936 bytes