Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8a3371fde6c13c…

MALICIOUS

PDF

39.5 KB Created: 2020-08-30 12:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5aaa718a4c1f16d2074ced89216c5b6 SHA-1: cd65a42b621228426cc99ab30a87c6771c4c2eaa SHA-256: 6b8a3371fde6c13c06317395470cbcded556eba246e319ab430e76f884a49e0b
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/wix?keyword=westbrook+cinema+4+brookhaven+ms', is flagged as a malicious redirector. The document also features a large number of external PDF links, suggesting an SEO link farm or a similar spamming technique. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent, likely related to driving traffic to malicious sites or potentially phishing.

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=westbrook+cinema+4+brookhaven+ms
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_8e05623e3ceb464f836ccff069055db1.pdf
    • https://static.usrfiles.com/ugd/30e015_50ff5c50eaff4a89af71b6a6b2812458.pdf
    • https://static.usrfiles.com/ugd/b8c837_fcf3dfdbe8d142f7a2f21ac2f973041f.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/36798231334.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0296/files/levekod.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wifufokamavobopizevotug.pdf
    • https://cdn.shopify.com/s/files/1/0435/5643/8165/files/motatisomutowugeg.pdf
    • https://cdn.shopify.com/s/files/1/0439/5030/9531/files/13810153195.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/mazotijag.pdf
    • https://static.usrfiles.com/ugd/b8c837_9ed621cae4ff4374b95ba5c56f3b0acf.pdf
    • https://static.usrfiles.com/ugd/8b2c09_5a33990977c840f8956ee04fbab16afe.pdf
    • https://static.usrfiles.com/ugd/b8c837_e6d01602948841ca831d1d93a96542a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf05ce16c7674097a1f1da5467c5178b.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c2822a9f28f4b95b2d64dc3fd33af63.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_off00004d9e.bin
28ab9b3b95022677a6db51ff592bed5f9bfe48cbb8fbaff070e6ac45bfdabe97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D9E 5160 bytes
font_01_sfnt_off00005f04.bin
1c8b9932552b18ab891273a4956a77f93d318ca9c04df8afea3fb3b5ca3bc2c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F04 10676 bytes
font_02_sfnt_off00008329.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8329 4324 bytes

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