Malicious PDF — malware analysis report

Static analysis result for SHA-256 1932a5323fb49b56…

MALICIOUS

PDF

41.4 KB Created: 2020-09-28 15:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03146b1e06257daab46d19b027e7d86a SHA-1: f9080b82abd2be05f20359846147975771bc971a SHA-256: 1932a5323fb49b561be3f82654075d19bb1051a020dd340dd6f16e548f642c85
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one prominently pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains the malicious URL. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the PDF structure itself is used to host and redirect to 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/mozel?keyword=academic+words+list+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/8069/4437/files/70711246972.pdf
    • https://cdn.shopify.com/s/files/1/0462/4171/0231/files/ginupigipazonamazorixob.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/22746581806.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18842325712.pdf
    • https://cdn.shopify.com/s/files/1/0431/3448/4648/files/61860752167.pdf
    • https://cdn.shopify.com/s/files/1/0429/6078/1465/files/20762145329.pdf
    • https://cdn.shopify.com/s/files/1/0429/0006/2367/files/12914916262.pdf
    • https://cdn.shopify.com/s/files/1/0428/5058/2684/files/1331591117.pdf
    • https://cdn.shopify.com/s/files/1/0434/4279/8757/files/fawexevonoxotojopanel.pdf
    • https://cdn.shopify.com/s/files/1/0457/6061/0460/files/adventurer_enrollment_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/1057/1940/files/conservation_of_angular_momentum_lab_report.pdf
    • https://cdn.shopify.com/s/files/1/0449/8341/9039/files/boundedness_math.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_off000065a0.bin
1c24a5bb384f0c739c9f19c13050b7eb811108d47f0fe7cb8819449275fe7f93
pdf-font-stream PDF embedded font (sfnt) at offset 0x65A0 5384 bytes
font_01_sfnt_off000077e6.bin
e42b405b052d21788cab559809593b7ee6e2e973a9a3fdac0ed3382cbbb4aec7
pdf-font-stream PDF embedded font (sfnt) at offset 0x77E6 9784 bytes