Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d51f5a2e8302c20…

MALICIOUS

PDF

45.2 KB Created: 2020-08-14 10:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e0fa3da1872a60fc217196b7a15d204 SHA-1: 1226ec07dc51a9b356fac96692bd1ce3c75662ec SHA-256: 6d51f5a2e8302c20cfc7ed1779450c21c683800bcfc4fe5d95317780494075c5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many of which point to a known malicious redirector infrastructure. The document body, though malformed, contains text related to medical guidelines and the malicious URL. The presence of a large number of links, including those to SEO-farmed PDFs, suggests an attempt to drive traffic or potentially distribute further malicious 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=chest+guidelines+2016+pulmonary+embolism
    • http://nawoso.nyctutor4kids.com/uploads/1/3/0/7/130738854/jofagavewo_bumerawiboxi_vilazerib_lipemulivemuxik.pdf
    • http://files.beatricecloakewatercolour.co.uk/uploads/1/3/2/6/132696274/wapemetubofiraruku.pdf
    • http://mezitonog.hummingbirdwordco.ca/uploads/1/3/1/8/131856713/nediwo-vabetotugizapi-migumalutokiso-geluzufove.pdf
    • http://files.youthpowerchange.com/uploads/1/3/0/9/130969403/0f1ae.pdf
    • http://files.darrellbissing.com/uploads/1/3/1/0/131071067/zilebagatax_pulalipumesob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5744/6038/files/javivipilulifatotega.pdf
    • https://cdn.shopify.com/s/files/1/0432/8164/5736/files/wedinitewiguse.pdf
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/piworinefukujuzada.pdf
    • https://cdn.shopify.com/s/files/1/0435/4755/8037/files/sorelafu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8731/4590/files/topop.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/best_reader_for_ipad_reddit.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/burnout_3_takedown_soundtrack.pdf
    • https://cdn.shopify.com/s/files/1/0432/5995/3312/files/36112387843.pdf
    • https://cdn.shopify.com/s/files/1/0445/4963/6255/files/foxanukunobufafakarepeka.pdf
    • https://cdn.shopify.com/s/files/1/0440/7279/6310/files/64145248794.pdf
    • https://cdn.shopify.com/s/files/1/0430/4932/0597/files/baltasar_and_blimunda.pdf
    • https://medlineplus.gov/languages/pulmonaryembolism.html
    • 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_off00007168.bin
1a3ebc105a6138bb0a7849771425ec62d14e7d70d7ecc0429514cecc52ac1fff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7168 6000 bytes
font_01_sfnt_off0000859d.bin
53a5a1432057e96012b9249669ee979b7ca1c9d853acfe452b2ee5e305e4d805		 pdf-font-stream PDF embedded font (sfnt) at offset 0x859D 9948 bytes

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