Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb288a32142e932e…

MALICIOUS

PDF

51.9 KB Created: 2020-08-15 18:40:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b70e6cd798f5f7ad265dad1a5aea441f SHA-1: 0652da97dbf6bf34e9da856c3fc57c5ad75f2378 SHA-256: cb288a32142e932ed424b8ea2b9a288543a4dfad0a6af136e9dfb6499cd32324
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=exercices+corrig%25C3%25A9s+atomistique+pdf', is designed to lure users to malicious infrastructure. The PDF also hosts a large number of external links, many pointing to Shopify, suggesting a link farm for SEO manipulation to distribute the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.cc/pify?keyword=exercices+corrig%25C3%25A9s+atomistique+pdf
    • http://files.waremiddleband.com/uploads/1/3/1/4/131437295/3732400.pdf
    • http://files.sweet-greetings.com/uploads/1/3/1/3/131384070/bemivenurixomumuburi.pdf
    • http://files.shelleypearsonwrites.com/uploads/1/3/1/4/131438038/vunodexep.pdf
    • https://cdn.shopify.com/s/files/1/0432/7912/2587/files/iec_61131.pdf
    • https://cdn.shopify.com/s/files/1/0431/2373/6725/files/zunijafavubo.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/semexipuzifemebagiliforom.pdf
    • https://cdn.shopify.com/s/files/1/0433/6012/5080/files/fezukarozigugimomumevesiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/5552/1695/files/va_form_10-_10ezr.pdf
    • https://cdn.shopify.com/s/files/1/0438/2310/4160/files/bunetaxofofogugu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9200/1433/files/94616779989.pdf
    • https://cdn.shopify.com/s/files/1/0433/6130/4728/files/wanefoseruma.pdf
    • https://cdn.shopify.com/s/files/1/0436/1909/0595/files/14538099484.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/29924026619.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008676.bin
9b25e441c741bab3c1bdcc2b363f066477a0fd380b85182218eba2d76489e5e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8676 5736 bytes
font_01_sfnt_off0000999d.bin
cafd3ea59677dd983c446556b04d63aff83c96e3b4523d97e974453f65ff80dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x999D 12404 bytes

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