Malicious PDF — malware analysis report

Static analysis result for SHA-256 33fa8c959424cd32…

MALICIOUS

PDF

44.3 KB Created: 2020-08-08 11:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3623d923f90cf3a9c2ac19064c69c467 SHA-1: 507b0edb5abccde2e43812da9e61ccf84b402bbb SHA-256: 33fa8c959424cd3206bd2ea1f1e28eef245f74b040c61be9331a96288999b7f9
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or SEO poisoning scheme designed to lure users to malicious sites. No scripts were extracted, but the presence of numerous links suggests an attempt 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/pify?keyword=spine+tuberculosis+pdf
    • http://files.balloonraces.com/uploads/1/3/2/7/132740423/4287146.pdf
    • http://files.martajardim.com/uploads/1/3/1/4/131453365/jotugobegan_fupokedakemivu.pdf
    • http://files.stevenpaulalvarez.net/uploads/1/3/0/7/130776611/1304770.pdf
    • http://lewisala.m13groves.org/uploads/1/3/1/4/131453060/41562f134202.pdf
    • http://files.mwprofessionalphotography.com/uploads/1/3/1/1/131163512/limorivasolo-pesefem-buvewovo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4151/3894/files/kuzixaxav.pdf
    • https://cdn.shopify.com/s/files/1/0429/3407/5558/files/33435772843.pdf
    • https://cdn.shopify.com/s/files/1/0431/2888/1313/files/45047130075.pdf
    • https://cdn.shopify.com/s/files/1/0434/3712/9895/files/activity_books_for_4_5_year_olds.pdf
    • https://cdn.shopify.com/s/files/1/0431/0627/1394/files/9661032982.pdf
    • https://cdn.shopify.com/s/files/1/0438/1143/8752/files/lamadoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/8144/9124/files/35919195279.pdf
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/21245289368.pdf
    • https://cdn.shopify.com/s/files/1/0439/0433/6040/files/big_data_analytics_for_cloud_iot_and_cognitive_computing_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/dubawibuborulisububizegom.pdf
    • https://cdn.shopify.com/s/files/1/0433/1972/2152/files/dagixutotanowufin.pdf
    • https://cdn.shopify.com/s/files/1/0427/4687/1974/files/97406042003.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_off00006e7a.bin
9bb3cd142738ab847b3ffb14e3fdfd0712dfe0fea3e81874e89173db9cecd3d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7A 5184 bytes
font_01_sfnt_off00008028.bin
790392d7f7bea2f65abd68620086d2eb56a7f5a689e084b1da3e919c19d19d18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8028 10728 bytes

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