Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95486680f737458…

MALICIOUS

PDF

56.6 KB Created: 2020-08-31 00:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8293e3c1ae249222cdd462e0b054a65 SHA-1: ddaeb45062cc2ee42514f3c3e7c56b574fe7c645 SHA-256: b95486680f737458e218b602d7618f6427044053ffe4100a4cad83e42484e38d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on static.usrfiles.com, forming a link farm. One of these links directs to a known malicious redirector at ttraff.com. The ML classifier also strongly indicated maliciousness. The document body appears to be corrupted or obfuscated, but the presence of the malicious redirector URL and the link farm heuristic are strong indicators of malicious intent, likely for SEO manipulation or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.com/wix?keyword=scrum+master+interview+questions+and
    • https://static.usrfiles.com/ugd/e2f197_cbca971e47df460d9ffd7b91d1e122b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb82a22829c948088fe3de00d5cd58b0.pdf
    • https://static.usrfiles.com/ugd/30e015_a0463850f5a94a82b61212b45227e08e.pdf
    • https://static.usrfiles.com/ugd/b8c837_df0594bf9dcc475f9739fd2f7802f66a.pdf
    • https://cdn.shopify.com/s/files/1/0439/1262/6344/files/555_portland_maine.pdf
    • https://cdn.shopify.com/s/files/1/0432/6244/3675/files/nonavudawi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6504/8229/files/harris_benedict_formel_zur_berechnung_des_grundumsatzes.pdf
    • https://static.usrfiles.com/ugd/f09a9d_30249bd865184284af4e736806e3e861.pdf
    • https://static.usrfiles.com/ugd/e8506d_7fb3171f92e840f2a8cfaf748b432970.pdf
    • https://static.usrfiles.com/ugd/b444d4_2dc9a0f1e452443598191be20ea63528.pdf
    • https://static.usrfiles.com/ugd/5ad03d_29de1aba45b5435e9a0dfea59a28cebf.pdf
    • https://static.usrfiles.com/ugd/b77b08_f37d9fdabd5443d09db59bd849696bcf.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/fipovoxepisaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8676/5475/files/skills_for_project_managers.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6817/files/swan_lake_theme_sheet_music_piano.pdf
    • https://cdn.shopify.com/s/files/1/0437/5589/6990/files/list_of_african_countries_and_their_capital_cities.pdf
    • https://cdn.shopify.com/s/files/1/0429/2539/2035/files/wanisumoxijemek.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_off00009ef1.bin
e114785cb7ee19c1b8776fa44226ba81bb9a393d33266870e74901cce18b9ed0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EF1 5432 bytes
font_01_sfnt_off0000b15a.bin
c2e2b70e636f227e91d57a0c6cdaaaca17d6478f90bab41c983e223eb6bec91f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB15A 10396 bytes

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