Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d49271f3bde17e8…

MALICIOUS

PDF

47.1 KB Created: 2020-09-02 04:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2fcec405483a2f3595651ae61bbceb31 SHA-1: b291fcf596682132801ac8376d81f8b6b75cbd9e SHA-256: 5d49271f3bde17e8acbec4b7f5fe317878cdbb630aa1ec501c7ebc27db9e1639
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, disguised with a seemingly legitimate keyword. The document also contains a large number of links to other PDFs, likely for SEO manipulation or to obscure the malicious redirector. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to direct users to harmful 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.me/wix?keyword=fibrous+dysplasia+treatment+guidelines
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4895/1194/files/fodevim.pdf
    • https://cdn.shopify.com/s/files/1/0438/0943/9906/files/12th_agri_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/7220/9574/files/pomerodoxulize.pdf
    • https://static.usrfiles.com/ugd/d162e3_32674fa518e3424494d1f04adea2755d.pdf
    • https://static.usrfiles.com/ugd/b8c837_cb6f0d2e3f224ffdbc54b9370b056c71.pdf
    • https://static.usrfiles.com/ugd/b8c837_d6709bc75bdb48f1aad4cab8ec6c77ee.pdf
    • https://static.usrfiles.com/ugd/b8c837_bcdba029e50f433c80ea3aa3731eb84a.pdf
    • https://cdn.shopify.com/s/files/1/0434/3821/1228/files/94750217808.pdf
    • https://cdn.shopify.com/s/files/1/0431/8189/9936/files/cambios_fisiologicos_y_psicologicos_durante_el_embarazo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4946/6526/files/handwriting_worksheets_numbers_printable.pdf
    • https://cdn.shopify.com/s/files/1/0429/5327/7596/files/69140439349.pdf
    • https://cdn.shopify.com/s/files/1/0433/9869/3013/files/zeros_of_polynomial_functions_worksheet.pdf
    • https://static.usrfiles.com/ugd/b8c837_d67b4c963fb44659a47360a24d2ee498.pdf
    • https://static.usrfiles.com/ugd/b8c837_109212912f9e47f2b456c70065e8bc87.pdf
    • https://static.usrfiles.com/ugd/865d50_6e5b52c9c6b2408fa8c3ffa83cba313c.pdf
    • https://static.usrfiles.com/ugd/b8c837_230c1e8b6a9d45e997fbecb745af5ea6.pdf
    • https://static.usrfiles.com/ugd/affb4a_91ddbc3aa2884192845ece7b52b9db6e.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_off000074b8.bin
4ec1c3a23ba904a53d765a7596a52d6b61edde12a47ac281f071c0ab3b2ea686		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B8 5476 bytes
font_01_sfnt_off00008742.bin
b35dbfadff6f26801ebbcb901ef01ece05d6715aba4467552384c7f964058663		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8742 12232 bytes

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