Malicious PDF — malware analysis report

Static analysis result for SHA-256 0809def4ac016810…

MALICIOUS

PDF

41.6 KB Created: 2020-08-08 08:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0658c2bf6c839a1916ac933b51af487b SHA-1: 3b29dbccb6feb035ad00904efc9d591d30332f3c SHA-256: 0809def4ac0168100a63de52f3a48b21ee0c9b080a28934851aaf6e90af89c9d
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. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract users searching for specific content. The ML classifier strongly indicates maliciousness, and the embedded links are a clear indicator of a phishing or redirection attempt.

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=the+beatles+let+it+be+sheet+music+pdf
    • http://zabokig.stoddardcountyhistory.com/uploads/1/3/0/8/130814124/kujaseji.pdf
    • http://files.lockmangenetics.com/uploads/1/3/0/7/130775383/nizejab.pdf
    • http://files.theplatinumbutton.com/uploads/1/3/2/7/132712306/lasojimuk.pdf
    • http://files.phyzarre.com/uploads/1/3/0/7/130776272/6886123.pdf
    • http://files.maccabbeebushcraft.com/uploads/1/3/0/7/130775645/1883830.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/4500/1115/files/pathfinder_wizard_spell_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/1984/5278/files/hatteras_harbor_fishing_report.pdf
    • https://cdn.shopify.com/s/files/1/0429/8860/1503/files/starting_business_plan.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/5649728322.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/bessemer_furnace.pdf
    • https://cdn.shopify.com/s/files/1/0433/0792/5654/files/76421279202.pdf
    • https://cdn.shopify.com/s/files/1/0431/0722/1658/files/58240260432.pdf
    • https://cdn.shopify.com/s/files/1/0430/7258/5888/files/cell_cycle_regulation_pogil.pdf
    • https://cdn.shopify.com/s/files/1/0435/9464/5672/files/91924104726.pdf
    • https://cdn.shopify.com/s/files/1/0438/1822/1728/files/tasoxozufokikafupudaxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2836/files/golare.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_off000063a2.bin
b8d116266219a9ac9f711b711c85d2b923111ed77ed603966e9c00959583d8c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x63A2 5388 bytes
font_01_sfnt_off000075ca.bin
4075ff425999683d0a0802ea910f1ab2a1cfc41aebd7899736884fa3d3f5c07a
pdf-font-stream PDF embedded font (sfnt) at offset 0x75CA 10504 bytes