Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd45cffb1bf0ad7…

MALICIOUS

PDF

49.5 KB Created: 2020-09-01 01:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af298adcb25760dcca707fbefd595b3c SHA-1: a2bb53e8d612de20d16dbee585a928421929efa4 SHA-256: 3dd45cffb1bf0ad7e69ba34dc025a579e328f0e06a09ff6934d0d3cf877e586d
150 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The primary attack pattern involves directing the user to the malicious URL: https://ttraff.com/wix?keyword=conservation+of+mass+experiment+worksheet. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the exact lure.

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/wix?keyword=conservation+of+mass+experiment+worksheet
    • https://static.usrfiles.com/ugd/b8c837_be43e3f1c62e4d03850889c24c0edb5f.pdf
    • https://static.usrfiles.com/ugd/162fe6_e103db3e90b24528b2e15e3d7cad9853.pdf
    • https://static.usrfiles.com/ugd/0d089b_610f346721d046febcc4910a875f6755.pdf
    • https://static.usrfiles.com/ugd/a1fb72_b9bed7a6a16341dea7506f905dadbc8a.pdf
    • https://static.usrfiles.com/ugd/b8c837_56651e16c1894a7dbea5127926c6d992.pdf
    • https://cdn.shopify.com/s/files/1/0435/8746/9471/files/bupariligibamuroxukege.pdf
    • https://cdn.shopify.com/s/files/1/0431/0971/2033/files/mscomct2_ocx_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepudanunakadop.pdf
    • https://cdn.shopify.com/s/files/1/0438/6953/6411/files/chain_rule_derivative_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0447/3022/0698/files/quantitative_risk_management_concepts_techniques_tools.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2283550224.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8542/files/java_bubble_sort.pdf
    • https://cdn.shopify.com/s/files/1/0431/0027/4845/files/8411049659.pdf
    • https://static.usrfiles.com/ugd/0adedf_d9f26219ed514259bc55dc82381378c4.pdf
    • https://static.usrfiles.com/ugd/eed56f_0a60e1d63e12477c8d93457ec00ce3dd.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_off00007bc4.bin
491e39384311ca20d1cb8e76f2f1020cd9a3c3fdc18b8eb274027a6811c131ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC4 5300 bytes
font_01_sfnt_off00008db7.bin
6e0a3687e0794f12b3d86cca64b8bfcbb543dcdb43424fb8aaec73cfc2a8187a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB7 13396 bytes

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