Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6e12ce1fa18e64…

MALICIOUS

PDF

44.6 KB Created: 2020-08-03 14:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebf68b9058e01bc570dd53de61361307 SHA-1: 051ce89a937c3d18e66d9ee8791d5f1bd88a82bc SHA-256: 7a6e12ce1fa18e64306e28b9b5284b44301c0d36615517cb9b0f61d6b93718b9
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Shopify-hosted PDFs, which is indicative of a link farm or SEO poisoning attack. One of the primary links, 'https://ttraff.ru/pify?keyword=lider+autocr%25C3%25A1tico+pdf', is flagged as a malicious redirector, suggesting the ultimate goal is to lead the user to malicious content. The ML classifier also strongly indicated maliciousness.

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=lider+autocr%25C3%25A1tico+pdf
    • http://files.reservoirfoodpantry.org/uploads/1/3/0/7/130775080/botanifudup-nitifufo-pivajexoz.pdf
    • http://files.stillpointatbeckside.com/uploads/1/3/1/6/131606011/wefugijux-zulapakilojidu.pdf
    • http://files.donalbury.com/uploads/1/3/0/8/130815014/6139423.pdf
    • http://files.thegauge.us/uploads/1/3/0/7/130776167/kobefelutakam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/nelut.pdf
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/star_wars_despecialized_download_kickass.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/.pdf
    • https://cdn.shopify.com/s/files/1/0436/4029/1486/files/61020504402.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0503/files/28928422776.pdf
    • https://cdn.shopify.com/s/files/1/0434/0688/5020/files/clash_of_clans_on_pc.pdf
    • https://cdn.shopify.com/s/files/1/0428/6844/1254/files/pofififokuvurafuxulix.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dedapefe.pdf
    • https://cdn.shopify.com/s/files/1/0439/4736/0424/files/jobitagasevela.pdf
    • https://cdn.shopify.com/s/files/1/0438/4089/7174/files/3834224683.pdf
    • https://cdn.shopify.com/s/files/1/0436/4507/5609/files/buritixizaxawad.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3156/files/vopeduluf.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8032/files/zozivisowutesiveb.pdf
    • https://cdn.shopify.com/s/files/1/0428/2934/9030/files/wowuvojogi.pdf
    • https://cdn.shopify.com/s/files/1/0429/4000/6559/files/wesubawosenob.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_off00006f27.bin
bbf82732e9b26d4f9ddc83a9ba2273ab8d592ac25710f9ce5245310c97d969d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F27 5112 bytes
font_01_sfnt_off00008015.bin
74f4dcc4d4669c9351c539752b1feaf61bd6923e08594123aeae198865de2779		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8015 11032 bytes

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