Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f1782c5e928161…

MALICIOUS

PDF

43.9 KB Created: 2020-08-01 18:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23274ab9f08159ddd2743c9affe31e6a SHA-1: 52a76580e24c2f235185d0f17e5d69b71a657080 SHA-256: 71f1782c5e9281616030f057bbb72c587e19494d7667f912039d778b77ec28df
154 Risk Score

Malware Insights

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

The PDF contains a link farm of 14 PDF files hosted on Shopify, with the primary link directing to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and references to other PDF files, suggesting a coordinated effort to distribute malicious content or conduct phishing. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

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/pify?keyword=not+falling+lyrics
    • http://files.stpaulshinckley.org/uploads/1/3/1/0/131071289/jopukuvamirudo.pdf
    • http://files.newchoicemusic.com/uploads/1/3/1/6/131606630/kulijuzuvokigevabaj.pdf
    • http://files.mechellestudio.com/uploads/1/3/1/4/131452735/pumapil-tebixufit-mizifu-rezagixum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/3937/5012/files/pat_sotheary_n_dara.pdf
    • https://cdn.shopify.com/s/files/1/0432/6732/6112/files/xuxibijopimegazudin.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/zegonavajuvubunatelip.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7110/files/26220129707.pdf
    • https://cdn.shopify.com/s/files/1/0437/3177/9733/files/73794772378.pdf
    • https://cdn.shopify.com/s/files/1/0432/9252/4700/files/94910788356.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4708/files/loludiwexolasu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0147/9321/files/fezorovo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3165/7621/files/donojad.pdf
    • https://cdn.shopify.com/s/files/1/0427/5548/9948/files/18415161441.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2297/files/84391294050.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_off00006239.bin
3f3b6d0a71c21f5964a9fd512f93748cf301e7cae0ca74c3107c08ead25376bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6239 4788 bytes
font_01_sfnt_off0000728f.bin
196a708b710b1dff84ef93848bf3b1dda01a4477a14a23d1feaeaa1ba9fcfe10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x728F 10120 bytes
font_02_sfnt_off00009523.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9523 4324 bytes

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