Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bbd63e5de96da0a…

MALICIOUS

PDF

45.4 KB Created: 2020-08-22 22:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89e23b779237e3626c32d2e460d2408e SHA-1: f5b0ecd5945df17db0b2792c5727c6838ab9bfbb SHA-256: 5bbd63e5de96da0a7405da9b41b50b9bfbb6c62bc36d88e3275b3e9553caae13
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body also contains numerous links to Shopify domains, likely part of a link farm, and one suspicious URL hosted on luxefordauction.com. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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=antivirus+boot+cd+free
    • http://files.luxefordauction.com/uploads/1/3/1/0/131070751/nofomuzirede.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8852/7006/files/someone_named_eva.pdf
    • https://cdn.shopify.com/s/files/1/0432/1925/5454/files/acrobat_vip_helpx.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12035000993.pdf
    • https://cdn.shopify.com/s/files/1/0440/5238/1846/files/bible_study_guide_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/9580/9431/files/35025062913.pdf
    • https://cdn.shopify.com/s/files/1/0430/8720/0418/files/sikolageboxuxaxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9900/4831/files/nabeninorekukakub.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/76006773120.pdf
    • https://cdn.shopify.com/s/files/1/0429/3214/2243/files/fasuzojepizikomom.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_off0000741b.bin
39437ef906161bb3ccfb9a035c453168b89ac02744a39afec7831bd76b4bb013		 pdf-font-stream PDF embedded font (sfnt) at offset 0x741B 4960 bytes
font_01_sfnt_off0000850b.bin
3977ba60a271f0b19b976078051c68df54dd01379dab6e9981feb9a8b89b4439		 pdf-font-stream PDF embedded font (sfnt) at offset 0x850B 10808 bytes

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