Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3ca56d717c943b…

MALICIOUS

PDF

48.1 KB Created: 2020-08-22 19:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4491822cc33ac7d1346b56a25fdd34f SHA-1: f00e065cbf67b7a6e767f62107e02cfb7f7bc089 SHA-256: 5b3ca56d717c943b2b8b09bf3211a546ad911776d1f5512c22de0381d79a82b9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a large external PDF link farm, suggesting an attempt to manipulate search engine results or distribute content through numerous links. The ML classifier also strongly flagged this PDF as malicious.

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=alpha+glucosidase+inhibition+assay+pdf
    • http://repupol.creativegeniuswithin.com/uploads/1/3/0/8/130874030/1345278.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/4037/2896/files/58350222998.pdf
    • https://cdn.shopify.com/s/files/1/0434/3644/1767/files/77848461620.pdf
    • https://cdn.shopify.com/s/files/1/0440/6899/5237/files/86850534008.pdf
    • https://cdn.shopify.com/s/files/1/0438/2038/4416/files/nate_dogg_net_worth.pdf
    • https://cdn.shopify.com/s/files/1/0435/7790/1219/files/subway_surfers_coins_hack.pdf
    • https://cdn.shopify.com/s/files/1/0439/3218/8840/files/garojafolipelo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6777/6919/files/karazobozeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/2853/6744/files/tiverilom.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/wuvidomesilagajojuwi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7170/0120/files/house_rent_agreement_format_sample.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_off0000701d.bin
0eab2c228e94be906d4654e306d6c7e78f95aa54937cb92812a81bc953febfdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x701D 5552 bytes
font_01_sfnt_off000082f8.bin
309b02943fbdd72876ed240e1044afaa23c95ae104e510f965d5adff056bd1f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82F8 15828 bytes

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