Malicious PDF — malware analysis report

Static analysis result for SHA-256 098835f7d107908b…

MALICIOUS

PDF

42.3 KB Created: 2020-08-01 13:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd705f38c65dbc5ab689f11ecea05b0a SHA-1: 2415e94aa207f0030a1633d12c722b1cf342b059 SHA-256: 098835f7d107908b4d07ffc3cccc125558aef89b5872f133748722f5f4144dbf
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

The PDF contains numerous external links, many pointing to PDF files hosted on Shopify and other domains, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=ant+downloader+chrome'. The document body also contains text related to 'Ant downloader chrome' and includes URLs that are likely part of the lure. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly indicates a social-engineering tactic to trick the user into installing something, which is a common method for credential theft or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=ant+downloader+chrome
    • http://files.godswaytshirts.com/uploads/1/3/2/3/132302815/7c24d7928c8eda5.pdf
    • http://files.carolgarbodenmurray.com/uploads/1/3/1/3/131398019/d1265c15a7cce3c.pdf
    • http://files.thepaullindereducationalfoundation.org/uploads/1/3/0/9/130969981/nuwejununu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/lexidumifinufewisosexe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dipipopiluniwewikojidil.pdf
    • https://cdn.shopify.com/s/files/1/0434/0131/4456/files/69052868208.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kubogofire.pdf
    • https://cdn.shopify.com/s/files/1/0431/0656/6306/files/xadubajidupodil.pdf
    • https://cdn.shopify.com/s/files/1/0439/7583/5806/files/2004_yamaha_v_star_650.pdf
    • https://cdn.shopify.com/s/files/1/0433/2797/9678/files/mitewadesamadeguzofuvojol.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4663/files/sunopevepimovinuwilirav.pdf
    • https://cdn.shopify.com/s/files/1/0429/9735/0554/files/pefiwowidu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6966/1589/files/17437541664.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9024/files/ps_form_3575.pdf
    • https://cdn.shopify.com/s/files/1/0435/9821/7374/files/20260772638.pdf
    • https://cdn.shopify.com/s/files/1/0437/6448/2202/files/fojetipuvaxudifaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47878122177.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_off0000670a.bin
ef7bcaabc2fee31611db7f5ab22f22519d0983bbf23fdfc7b02cc50ee738b1ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x670A 5084 bytes
font_01_sfnt_off00007839.bin
88a8a1bb04e93c80e53b4c789855f99504d694c349b0afd11c45f89cb601d644		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7839 10724 bytes

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