Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8e7e1ed5ce8f06…

MALICIOUS

PDF

34.2 KB Created: 2020-08-22 01:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a38fd169fa46d5502a2ff376f9e4f2f SHA-1: 8d86a2d3fd56d02fee59b93eab9f48d9c8d5faf7 SHA-256: ac8e7e1ed5ce8f064a5ed5f617ed118cd758f155961cab059b6d31e8e3e2784d
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass external link farm, with a primary link pointing to a redirector. The document body, though heavily obfuscated, contains text related to 'hodder gcse physics textbook answers' and a URL that appears to be a lure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the presence of a link to known malicious redirector infrastructure.

Heuristics 3

  • 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.
  • 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=hodder+gcse+physics+textbook+answers
    • http://files.fbcq.org/uploads/1/3/1/0/131070918/458b66e.pdf
    • http://files.huyckpreserve.org/uploads/1/3/2/6/132682639/kudenomolapirado.pdf
    • http://files.thepinkearpixie.com/uploads/1/3/0/9/130969172/6237722.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8861538602.pdf
    • https://cdn.shopify.com/s/files/1/0429/6510/6847/files/upper_peninsula_michigan_weather_report.pdf
    • https://cdn.shopify.com/s/files/1/0435/0076/5336/files/nazuruxorulija.pdf
    • https://cdn.shopify.com/s/files/1/0430/9545/7946/files/ashokan_farewell_sheet_music_violin_and_cello.pdf
    • https://cdn.shopify.com/s/files/1/0440/8039/8486/files/behaviorist_theory_of_language_development.pdf
    • https://cdn.shopify.com/s/files/1/0430/8543/0945/files/chirkut_film_song.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7407/files/rozugukarikewabu.pdf
    • https://cdn.shopify.com/s/files/1/0454/0645/3928/files/bmw_m_performance_parts_canada.pdf
    • https://cdn.shopify.com/s/files/1/0436/6503/1321/files/ghulam_ali_ghazals.pdf
    • https://cdn.shopify.com/s/files/1/0433/4849/2438/files/42873768574.pdf
    • https://cdn.shopify.com/s/files/1/0431/6895/6578/files/free_wonderlic_test.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004532.bin
abdceb9d143cd46c5e98aaed87e4ae28fc251b25164d6c93bd08817a0e44a761		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4532 5728 bytes
font_01_sfnt_off000058c7.bin
5e0b1ea7bcf6be151414a8cf5bb0119d607633b44d816ec26f16c269154b31eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58C7 10304 bytes

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