Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3fd7bf49185d4c…

MALICIOUS

PDF

48.1 KB Created: 2020-08-30 01:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3360a33ce2f203963a3ec9d31ee40831 SHA-1: 647f738db86a2e616ebec37cf065193b4dd52204 SHA-256: 1d3fd7bf49185d4ccf38244696abfd4cbd7567754c1bfc6c6a4f651d7c03f24d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a significant number of embedded links, with one identified as a known malicious redirector. The document body, though partially corrupted, includes the same URL found in the heuristics, suggesting a lure to external malicious content. The presence of numerous links points towards a link farm or redirection strategy to distribute malicious payloads or phishing pages.

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/wix?keyword=very+short+plot+summary+of+death+of
    • https://cdn.shopify.com/s/files/1/0435/8130/9083/files/comilla_board_result_2019_with_marksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/8106/2813/files/libro_bhagavad_gita_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5962/files/71869100316.pdf
    • https://cdn.shopify.com/s/files/1/0432/9553/9368/files/56297266080.pdf
    • https://static.usrfiles.com/ugd/191a6d_e04f0dd2e2f34fd7a1d94533c2c5a82e.pdf
    • https://static.usrfiles.com/ugd/a382ee_527b136069cd4d53b30ff4f16f0e7fd5.pdf
    • https://static.usrfiles.com/ugd/97634b_baa0541ea57048a8ab6f82ba92709d5b.pdf
    • https://static.usrfiles.com/ugd/0c4177_2901caad79bb474db68f40ff97c9cb1a.pdf
    • https://static.usrfiles.com/ugd/63022f_6be4cc3e81c74f919df7e70a54f883ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_2bb73b75561047939d52aa76e6e8a4b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_17019950445d40e2b4290c7219e8af36.pdf
    • https://static.usrfiles.com/ugd/493135_1e2d6d63ac634937af8817b835239c03.pdf
    • https://static.usrfiles.com/ugd/b8c837_8efc84ac797149e7b103bb65430a3f90.pdf
    • https://static.usrfiles.com/ugd/b8c837_47290f84890a4e0d8e292dde9666bc21.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c6863ba88144bb3a23b51bf74ff5727.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007fa6.bin
264e9c91dadbba26dc66c37f69e78dc98fb2d4d06b93636b0bef00899dda4894
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA6 5348 bytes
font_01_sfnt_off000091bd.bin
2d9c0f3c90d89035e20c67d0eebc6889a377925c65043db3b304eff1c59e215a
pdf-font-stream PDF embedded font (sfnt) at offset 0x91BD 9904 bytes