Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e96e740b3444f7…

MALICIOUS

PDF

37.9 KB Created: 2020-08-30 23:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72505696819581309ae30abb416fcb0d SHA-1: 8ccfa43d2cafd77637b0b9148d71fe885e69b30c SHA-256: 33e96e740b3444f7061d72113198dd4c2ab12396a635aa55e9fdb2ce84424b2d
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 pointing to Shopify-hosted PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/wix?keyword=strategic+brand+management+keller+pd'. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous links and the redirector URL point to a malicious intent to direct users to potentially harmful content.

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/wix?keyword=strategic+brand+management+keller+pd
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6457/3593/files/gerezimidudavamevufenumar.pdf
    • https://cdn.shopify.com/s/files/1/0431/5355/5624/files/battery_report_suspended.pdf
    • https://cdn.shopify.com/s/files/1/0432/2564/5224/files/adjectival_phrases_worksheet_ks2.pdf
    • https://cdn.shopify.com/s/files/1/0439/1672/2331/files/colors_tv_app_for_rising_star.pdf
    • https://cdn.shopify.com/s/files/1/0427/9068/2783/files/bongo_latest_music_videos.pdf
    • https://static.usrfiles.com/ugd/bd5c68_75b7368728fa458884691fe254054e5d.pdf
    • https://static.usrfiles.com/ugd/3b7182_715658a413064511a30ce49b6eed0a30.pdf
    • https://static.usrfiles.com/ugd/b8c837_14cb80bdcb40485c9783e7d101722bf0.pdf
    • https://static.usrfiles.com/ugd/fd3290_229240ac17c5472b8aca11d85ce1e3c9.pdf
    • https://cdn.shopify.com/s/files/1/0440/5064/5157/files/factoring_polynomials_fractions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5435/files/vs_code_extensions_as_vsix.pdf
    • https://cdn.shopify.com/s/files/1/0433/0828/6105/files/jawumoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/2068/9306/files/11232960072.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_off00005442.bin
7b2f7ea498bf366d3d91374abc63008e3832b52b74409f1a2f71cbc2765761a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5442 5524 bytes
font_01_sfnt_off000066e1.bin
13eacbabbfaf7b33a630beab6d767cbbdb20b4877fcc17dc731f632e30661d9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x66E1 10572 bytes