Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf188c85e444cf2…

MALICIOUS

PDF

41.3 KB Created: 2020-09-18 17:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02133fb590ca5b4074983a1cf1369c2c SHA-1: 872df1781164122de354f2d034f3d5c650fa19c8 SHA-256: 5cf188c85e444cf2118f6c16b5eadadd72e900cb6d7364b5d3804f0b716f0275
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to a redirector known to host malicious content. The ML classifier also strongly indicated maliciousness. The document's apparent purpose is to act as a link farm, directing users to potentially harmful external sites.

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.cc/wb?keyword=domain%20and%20range%20interval%20notation%20worksheet%20pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0c8f9cef-1ad3-4386-8f41-a5149f0d9779.filesusr.com/ugd/466fa0_3b754df37b0c46558eba1c82436f4df8.pdf?index=true
    • https://9ca0c423-5274-4e1c-a863-14729787837a.filesusr.com/ugd/1c44ce_1ec898299d564dcdb77f61ca52d340cb.pdf?index=true
    • https://85f1cab6-5b2b-47b4-b0c4-b28cf8d2b490.filesusr.com/ugd/3be3a7_d88b58a579654d1e9b36afabbb18ca19.pdf?index=true
    • https://eaf303b5-1d00-4702-b881-46ccbc9f8bac.filesusr.com/ugd/bb4607_282448fe23c542b2a1e4cb026ef15a88.pdf?index=true
    • https://b2e17484-e3ba-4858-ac6a-5d5d992aa354.filesusr.com/ugd/dfb5f8_d7655b0074774908a5264e9dea3e288e.pdf?index=true
    • https://f0bd1bbd-74c8-4870-9d0f-4ce3d1e3104e.filesusr.com/ugd/03a576_110adbec254843e3bbe8118a8a497aaf.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0435/9254/8511/files/tujogubeboterezutekudu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0718/0954/files/xuxonozebexogizin.pdf
    • https://09ffdb76-d164-4f4b-84d8-0cef7936983b.filesusr.com/ugd/d1fcfc_0dbc9a61774744e89a01e76a2d2b1255.pdf?index=true
    • https://1e68389c-b77b-4a1b-9108-d462ff9f0073.filesusr.com/ugd/74c34a_9d3389a34cf4420290c3a23b57943ab7.pdf?index=true
    • https://cb72c767-7123-4c26-bd01-79bf786ef1ef.filesusr.com/ugd/771ea4_edff17dce8b8470dbce4dfea05cae2b7.pdf?index=true
    • https://86f86c7b-8de2-4d5a-8da0-1ed6d2832a32.filesusr.com/ugd/cc089a_3ffc165d590f4ca99c951a2809777fd6.pdf?index=true
    • https://686ebb5d-f05d-4df6-865f-63e4dc93d813.filesusr.com/ugd/e481ce_817347028e41491ca7f7846621a16139.pdf?index=true
    • 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_off00006338.bin
929cd73e274a65f8252bd17184f4c2576ccdba7c49c725ec4647c3c3652598c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6338 5668 bytes
font_01_sfnt_off0000766f.bin
df4cc52f8bc2f27e50f662fe74890e623ed5205f1ced6016d12e28bd2bcc229c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x766F 9948 bytes

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