Malicious PDF — malware analysis report

Static analysis result for SHA-256 25fe34d91165fdf0…

MALICIOUS

PDF

45.8 KB Created: 2020-09-16 15:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03a15577c8da0e7f0f15bb3016afdab3 SHA-1: a9397f89711c385c7211d24277165a9674c691bc SHA-256: 25fe34d91165fdf058959b006abed4eaad5e3101fce7287696d2322470e57888
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in

The PDF file contains a significant number of embedded external links, indicative of a link farm designed to manipulate search engine rankings or distribute malicious content. One of these links, https://ttraff.ru/wb?keyword=resumen%20there%20are%20more%20things%20jorge%20luis%20borges, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated.

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/wb?keyword=resumen%20there%20are%20more%20things%20jorge%20luis%20borges
    • https://383e18b2-e7f7-4535-830d-08aa0d6daee1.filesusr.com/ugd/ac8c68_4d58a765a87c4a04be1db7fb2a9abbce.pdf?index=true
    • https://ab0f623f-7d6a-4c58-b751-c42d2c0d4320.filesusr.com/ugd/a91264_9e9d6196ef164a208f8e535d6c1016d6.pdf?index=true
    • https://3f25dd9f-3614-4f1d-a894-2d288cdfd54f.filesusr.com/ugd/1c44ce_b308310ca3c54b70af27cb9cde96d5a4.pdf?index=true
    • https://a6cfe44e-a6eb-4efe-91e9-8818fffa49e4.filesusr.com/ugd/277b62_d1633efa0b24476ea47e952cb2500e8b.pdf?index=true
    • https://5becebd8-418b-4bda-ac5e-e558b111ce3e.filesusr.com/ugd/f08e01_a58cf9bc7935418a86c4590a80e709d6.pdf?index=true
    • https://11f5a786-6160-4010-a517-1b0e27c21d3e.filesusr.com/ugd/1cc777_e4f4428af8e64e16a717985682f7a4b9.pdf?index=true
    • https://e0648212-fe84-4d62-8c42-ff1edd3b96eb.filesusr.com/ugd/7f614e_6885b89dc1404e228e358e550a5416b4.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0432/5077/8269/files/welder_red_seal_exam_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/4709/9290/files/physiology_of_human_respiratory_system.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/ff14_machinist_guide_2019.pdf
    • https://cdn.shopify.com/s/files/1/0436/2056/5156/files/31685019455.pdf
    • https://cdn.shopify.com/s/files/1/0452/8229/5969/files/cantar_a_beleza_da_vida.pdf
    • https://cdn.shopify.com/s/files/1/0438/9126/1595/files/nba_hoop_troop_unblocked_games_at_school.pdf
    • https://cdn.shopify.com/s/files/1/0440/2446/3525/files/desh_bhakti_songs_zip_file.pdf
    • https://cdn.shopify.com/s/files/1/0432/0310/0832/files/bejatitogadurolakebew.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_off000063e6.bin
29042b292375549d62aa78949230a70642e60fa3f13d92a09d3306080f3d605f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63E6 5204 bytes
font_01_sfnt_off00007567.bin
dea5f21e4cfec2485192da2c35d6771a20381920c7a4a0e34856788f8d15934e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7567 11276 bytes
font_02_sfnt_off00009a0e.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A0E 4324 bytes

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