Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e82e8b0727228a5…

MALICIOUS

PDF

43.4 KB Created: 2020-08-31 09:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e6992cbcb7bc221c8afcc14f2f90ec5f SHA-1: 6c8f2c5b87a6828ad03588015c68320a19654406 SHA-256: 1e82e8b0727228a53be3c38bff2827e2d9f06eb11b5c683241092dc83e26d73f
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link leads to a URL that is part of a link farm, suggesting an attempt to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

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.link/wix?keyword=how+to+use+auxiliary+verbs+in+english+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5955/9065/files/lg_bm_lds302.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2027/1272/files/operation_management_krajewski.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6616/2341/files/63647356889.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/105a8c_593e969017b5416388ca3cb258f71890.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/99a8f2_85971e0681cb4259b23d2d267d616351.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/9483/6127/files/queen_size_fleece_fitted_sheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8025/3593/files/livikenufowibip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0444/5303/6199/files/language_teacher_professional_development.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/111c46_6eec3adae53d485fad03f3d344e59c55.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_2a1e9ed9af8348829b09275e7dde7270.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0fdb6d_523365f0c47049bcb8f29acec054539c.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A82 5728 bytes
SHA-256: cc289b060624c238c158132c4c8c3ac75906abaca6e831ffa5e264eac3856fa9
font_01_sfnt_off00007e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E0A 10108 bytes
SHA-256: f7a6b57c2825b65fbda337e4ee67066dc210d882fbf01940a030f79e848f4a58

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