Malicious PDF — malware analysis report

Static analysis result for SHA-256 173402dae80e289b…

MALICIOUS

PDF

41.9 KB Created: 2020-08-11 05:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78dcced7c56ddd3ef31904ed6e7702c0 SHA-1: 6e729e991ac5db38281c005b9d1d8e88cbc72798 SHA-256: 173402dae80e289b669ac743f8b7af0264559eae2834e00c1f3ca2afbf4662f0
194 Risk Score

Malware Insights

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

The PDF contains a lure to install a browser extension, as indicated by the 'SE_BROWSER_INSTALL_LURE' heuristic. It also links to known malicious redirector infrastructure via the URL 'https://ttraff.com/pify?keyword=webpage+to+pdf+firefox+plugin'. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.com/pify?keyword=webpage+to+pdf+firefox+plugin
    • http://lexejegi.bacmedicalmarketing.com/uploads/1/3/1/1/131164312/3f54ed64c.pdf
    • http://files.bosfchounds.com/uploads/1/3/0/7/130739021/geriz.pdf
    • http://files.johnelliottmusic.com/uploads/1/3/0/8/130873995/798441.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6265/6152/files/alfie_kohn_theory.pdf
    • https://cdn.shopify.com/s/files/1/0437/8047/2984/files/possessive_adjectives_spanish_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/9834/9471/files/16952745741.pdf
    • https://cdn.shopify.com/s/files/1/0440/0575/2997/files/brew_uninstall_git.pdf
    • https://cdn.shopify.com/s/files/1/0434/7917/1222/files/42678138838.pdf
    • https://cdn.shopify.com/s/files/1/0431/2953/6676/files/ahsoka_tano_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/5394/0887/files/ladim.pdf
    • https://cdn.shopify.com/s/files/1/0432/8239/9390/files/centrifugal_pump_casing_design.pdf
    • https://cdn.shopify.com/s/files/1/0429/3168/3484/files/icao_annex_11_air_traffic_services.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/lunubudeluxajok.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5183/files/97615710418.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_off0000637f.bin
cc189d69781d1b399de8e41c3f7b1b3fb9d13cd98612fdf374d84477b2fe3bac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x637F 5252 bytes
font_01_sfnt_off00007576.bin
dcfe4e76545633435f7d7511293782d5660aff4ef464112749ef1b2f9e6d6c7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7576 10544 bytes

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