Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8889a32bbb59f5…

MALICIOUS

PDF

118.2 KB Created: 2020-08-11 13:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc85eefa30b6b6b04fc295656dfaa022 SHA-1: b9753cc0d5c8820f357ee9f6e9a1759216180fd3 SHA-256: 5d8889a32bbb59f5ad0be7ffee0d3ddc02352df9df46f79f476115a485591eeb
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to redirect users to malicious content. One prominent URL, 'https://ttraff.ru/pify?keyword=alguma+poesia+pdf+completo', is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection and 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/pify?keyword=alguma+poesia+pdf+completo
    • http://zodapuk.gsknoxville.com/uploads/1/3/1/4/131408024/pigiporixobib.pdf
    • http://files.dorsetbumptobabyshow.co.uk/uploads/1/3/0/8/130874645/4739827.pdf
    • http://files.soscarsoncity.org/uploads/1/3/0/9/130969809/8819411.pdf
    • http://rogeduge.hazelblake.com/uploads/1/3/0/8/130814575/gejux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9807/1450/files/xxplosive_dr_dre.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1122/files/i_stand_amazed_in_the_presence_chords.pdf
    • https://cdn.shopify.com/s/files/1/0433/8126/0440/files/vubitosafabef.pdf
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/oregon_trail_card_game_rules.pdf
    • https://cdn.shopify.com/s/files/1/0428/8105/6935/files/52103405556.pdf
    • https://cdn.shopify.com/s/files/1/0439/0364/7912/files/how_to_check_host_files.pdf
    • https://cdn.shopify.com/s/files/1/0444/8839/2871/files/harry_potter_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5014/7733/files/46111870524.pdf
    • https://cdn.shopify.com/s/files/1/0430/0839/3369/files/lenepupixefaxe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tuwaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/5163/9196/files/puzomojunagiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9147/7148/files/modern_physical_organic_chemistry_anslyn.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_off000194a0.bin
fb794c3b31ac08c91b8688d86b671cdc0d592039f0b745596dd92bdd3d41ba00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x194A0 5368 bytes
font_01_sfnt_off0001a6d7.bin
69320aaf931f356eb75a248ac09d96235506e0937d6e197fb82d84bcae93e0c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6D7 10864 bytes

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