Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b0cc9eedc76d55…

MALICIOUS

PDF

39.4 KB Created: 2020-08-24 17:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8fac804d7dfdb94f806af90ab41cb1a6 SHA-1: a753494d63cc93405f9c61aac0df87439a855330 SHA-256: 80b0cc9eedc76d5506d7b35a7d59f11527289326e8222af23fc5c9af8f08a1a3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=corned+beef+nutritional+information+uk'. The document body, though heavily obfuscated, also contains this URL and other Shopify links, indicating a potential lure to malicious content. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=corned+beef+nutritional+information+uk
    • http://solizefu.miralindaphotography.com/uploads/1/3/2/6/132680835/3b740c.pdf
    • http://pitegoso.camarillospringsseniorgolf.com/uploads/1/3/0/7/130775612/pugeketerivubuwi.pdf
    • http://files.dalslandholidays.com/uploads/1/3/1/4/131453823/riwusamejefox.pdf
    • http://files.sailorstclaire.com/uploads/1/3/1/3/131382320/voxujadipupij_kuwenem_lirigisupusa_banewu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7320/7446/files/hill_of_beans_ncsu.pdf
    • https://cdn.shopify.com/s/files/1/0427/5660/4070/files/brunson_poker.pdf
    • https://cdn.shopify.com/s/files/1/0437/7175/6698/files/ad_d_rogues_gallery.pdf
    • https://cdn.shopify.com/s/files/1/0434/5144/9496/files/75686208434.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/makukas.pdf
    • https://cdn.shopify.com/s/files/1/0436/0372/2402/files/sa_spelling_test_blank_answer_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/3477/9553/files/british_council_learn_english_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0436/1604/3168/files/lupoxufe.pdf
    • https://cdn.shopify.com/s/files/1/0441/0517/1096/files/java_spring_resttemplate_example.pdf
    • https://cdn.shopify.com/s/files/1/0431/8402/9854/files/zimegogorawelusowar.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c21.bin
75b8c3376b72b355db131e5c6e0196148a941475e1b7e1890b1ca36ed3aa747f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C21 4984 bytes
font_01_sfnt_off00006cfb.bin
daf766c5011db52738cf1c63c10671ce9f77631ec8df1714647a1fc86b6ddd25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFB 10536 bytes

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