Malicious PDF — malware analysis report

Static analysis result for SHA-256 51781306e8ea0ec5…

MALICIOUS

PDF

45.5 KB Created: 2020-08-11 04:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae415dd0c6e8d30fa1db1dfe830a1305 SHA-1: 56121a28fe936b9a357ca23520a9ece19c625316 SHA-256: 51781306e8ea0ec5e0bf783c35a49676be324c5086e4996c4eb0e8d44a4acb02
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be luring the user to the malicious URL via the embedded links, likely for a phishing or malware distribution attempt. No scripts were extracted, limiting the analysis of direct payload execution.

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.com/pify?keyword=mediana+estadistica+pdf
    • http://files.newworldtribe.us/uploads/1/3/0/8/130874143/6813ca.pdf
    • http://files.earthwiselearningcenter.com/uploads/1/3/1/3/131382590/fajokotonuw_nubodaxazexiji.pdf
    • http://files.cougarthreads.com/uploads/1/3/0/7/130740438/bbfae0a5e4.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32377204601.pdf
    • https://cdn.shopify.com/s/files/1/0430/1484/8671/files/cerwin_vega_vpas10_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/4916/4705/files/mosadirujekufatuwi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/11166673771.pdf
    • https://cdn.shopify.com/s/files/1/0432/1515/9458/files/94624668050.pdf
    • https://cdn.shopify.com/s/files/1/0438/4430/5056/files/30964164739.pdf
    • https://cdn.shopify.com/s/files/1/0430/6544/2457/files/nomutu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3577/0535/files/sample_company_profile_design.pdf
    • https://cdn.shopify.com/s/files/1/0433/9567/8357/files/98484313261.pdf
    • https://cdn.shopify.com/s/files/1/0429/8060/6111/files/tosaxevezumexivebowavuwi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87678197609.pdf
    • https://cdn.shopify.com/s/files/1/0437/1103/7591/files/xolikudirej.pdf
    • https://cdn.shopify.com/s/files/1/0429/2077/1750/files/adding_mixed_numbers_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0435/8311/1323/files/71854625098.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_off0000672a.bin
7d5707494a9d6fa34d0beef2ec43f8a84d0ac62101f3055efd45aeee7a066668		 pdf-font-stream PDF embedded font (sfnt) at offset 0x672A 5028 bytes
font_01_sfnt_off00007859.bin
3aed759fdcc7a33d622efa28c7b19b53e106ccbca9ff44ca1d16a98851b5be55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7859 15676 bytes

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