Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec0fe6d58b2da6b…

MALICIOUS

PDF

43.5 KB Created: 2020-08-03 23:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abe0048895274162239cb9750b15c66d SHA-1: f414458993b9c0e8c1c5ab247bc3ba67bd71db65 SHA-256: 8ec0fe6d58b2da6b36b7bfa5ad13873a862a4f18e8ae94e28f191b4ef1627e59
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a 'weekly study schedule pdf' lure, and the embedded URLs are consistent with a link farm or phishing attempt. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK strongly indicates malicious intent, likely to redirect users to a site for further exploitation or credential harvesting.

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.ru/pify?keyword=weekly+study+schedule+pdf
    • http://files.jmaisd.net/uploads/1/3/1/4/131438137/f41ea4.pdf
    • http://files.mathtalks.net/uploads/1/3/1/4/131453252/2456137.pdf
    • http://files.louthbeekeeping.com/uploads/1/3/1/3/131398195/kadadoponi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0805/6740/files/72692988866.pdf
    • https://cdn.shopify.com/s/files/1/0435/4965/5203/files/motaragipoje.pdf
    • https://cdn.shopify.com/s/files/1/0428/2381/1239/files/xarobizefipiwunu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/red_chins_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0432/8642/9861/files/99635222851.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80789229335.pdf
    • https://cdn.shopify.com/s/files/1/0435/6676/0095/files/maxomasazaxavufilotu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7017/6932/files/pat_test_pbsc.pdf
    • https://cdn.shopify.com/s/files/1/0434/8765/8141/files/bisum.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8535/files/67511875755.pdf
    • https://cdn.shopify.com/s/files/1/0433/9659/5870/files/zekanatibikorezan.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/
    • https://cdn.shopify.com/s/files/1/0433/9659/5870/files/zekanatibikore

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d8a.bin
f44f97eceeb8957176c4bafe162d4a3e1891c63d4e510be48dbcd0cdb11cf17f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8A 5116 bytes
font_01_sfnt_off00007f14.bin
370a63458a651ebaa8ec61f9e42812ef67208b48545b42bb82a30ea2922dd78c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F14 9980 bytes

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