Malicious PDF — malware analysis report

Static analysis result for SHA-256 649ccbb37975e60b…

MALICIOUS

PDF

44.8 KB Created: 2020-08-31 15:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 161bc725c9a8da99c9f2175d63fbbb67 SHA-1: d1a23984a4ec41ae7b84daf57e076f56146ca0d9 SHA-256: 649ccbb37975e60be051e2015406c64792c513deae097c37431b0c0f6813b97c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links to other PDF documents, a technique often used for SEO poisoning or to distribute malicious content. One of the primary links directs to a known malicious redirector, ttraff.ru, which is likely used to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of embedded URLs and the link farm heuristic suggest a phishing or redirection attack.

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.ru/wix?keyword=acceptable+forms+of+id+for+flying
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/6787/5221/files/pearson_texas_chemistry_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/sed_command_in_linux_with_examples.pdf
    • https://cdn.shopify.com/s/files/1/0430/1045/7753/files/woworipuguxowubupejido.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2680/files/nedasufanujavikigibager.pdf
    • https://static.usrfiles.com/ugd/b8c837_13281f00f0d746fb824f14a438d82bfa.pdf
    • https://static.usrfiles.com/ugd/538d67_d1246d9b197c417fafad0498b13a8582.pdf
    • https://static.usrfiles.com/ugd/b8c837_aa9ca426d15349f3a5bc093628f85eeb.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed84d129d6d0410a94a5d885818b2d5d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4d5a3f40d5e4d52bc93b49c16d61ffc.pdf
    • https://static.usrfiles.com/ugd/b8c837_3a08abdde3d64b1598a162903453a622.pdf
    • https://static.usrfiles.com/ugd/f63f29_a9ef833f42c6496fa6092e9207ba12ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_f3b654f51e954338b4cbf57c9b712593.pdf
    • https://cdn.shopify.com/s/files/1/0435/3087/9125/files/megikiwaxag.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3479/files/mepuvaresalakirose.pdf
    • https://cdn.shopify.com/s/files/1/0431/7495/3120/files/dilejetekegen.pdf
    • https://cdn.shopify.com/s/files/1/0436/6116/4697/files/wujavukadarawufenuborem.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062b9.bin
07bc45ff22bbd9bd376e629cac4ef0f3357fc641d0864d01e8ffc2475e33dcaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62B9 5496 bytes
font_01_sfnt_off00007541.bin
8d3c74de3fad1167a762390b6946fe5c027f8061144b9c445f19fe4108fd9c41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7541 10256 bytes
font_02_sfnt_off00009825.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9825 4324 bytes

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