Malicious PDF — malware analysis report

Static analysis result for SHA-256 435c4f64d3f0faa9…

MALICIOUS

PDF

42.0 KB Created: 2020-09-02 06:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31baa66a6742ab8886f21a004e30a7a1 SHA-1: 8aca267a3b16af08fbabf5f79ae3e79b24a90f2a SHA-256: 435c4f64d3f0faa92c48953c68efab5b8cbbcc5eae193f5e895b13fe5cabde7f
92 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to a 'checkbook balance spreadsheet' and the malicious URL. This suggests a phishing attempt designed to redirect users to a malicious site, likely for further exploitation or credential harvesting. No scripts were extracted, limiting the analysis of specific execution chains.

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.
  • 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/wix?keyword=checkbook+balance+spreadsheet
    • https://cdn.shopify.com/s/files/1/0431/7777/1164/files/coats_tire_machine_troubleshooting.pdf
    • https://cdn.shopify.com/s/files/1/0435/9805/3539/files/asco_cap_her2_guidelines_2013.pdf
    • https://cdn.shopify.com/s/files/1/0438/9509/5464/files/burofisivule.pdf
    • https://static.usrfiles.com/ugd/902d29_175536b3b04445599c95858840b63f66.pdf
    • https://static.usrfiles.com/ugd/b8c837_db8c6c37836142628832b224ca873684.pdf
    • https://static.usrfiles.com/ugd/6846fe_97cfbbc3c47844209940b3e95eb9cc0d.pdf
    • https://static.usrfiles.com/ugd/3ce946_5e976434660d4eeea077c1f4dc3ebc5a.pdf
    • https://static.usrfiles.com/ugd/eb2f7d_62263f2b2549427eb9ec22d2d99141f4.pdf
    • https://static.usrfiles.com/ugd/3e5db3_64edda06b7d44df5a20ac495d558aebe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005967.bin
5a3f974d19104fe25684137e2d5a8a29eb3a11c5db37a91e9f4483a3346a5051		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5967 5128 bytes
font_01_sfnt_off00006ab8.bin
1bae606b7d7a504ceb102f9ead87c7fa649676df8d48ef96a60d2cd82c1fc918		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB8 10216 bytes
font_02_sfnt_off00008db2.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB2 4324 bytes

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