Malicious PDF — malware analysis report

Static analysis result for SHA-256 b034ea89f693526d…

MALICIOUS

PDF

42.1 KB Created: 2020-08-31 01:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1836823abeaf7129e62d360daab71d2 SHA-1: 1ed4511977780064c3d82a1afb05aad287cab02d SHA-256: b034ea89f693526dd9fc48cd0646972b845cdc68d24befbc737920eebfc30709
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, with one pointing to a known malicious redirector. The document body itself is largely unreadable binary data, but the presence of numerous links, including one to a suspicious domain, strongly suggests a malicious intent. The ML classifier also flagged this PDF with high confidence.

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=the+fall+of+gondolin+pdf
    • https://static.usrfiles.com/ugd/8b49c6_4145559a3cf448bca2dd5899559e5191.pdf
    • https://static.usrfiles.com/ugd/bae363_1fadc20d69584db0aafa49ff702e1c5b.pdf
    • https://static.usrfiles.com/ugd/b8c837_ea030219718d476f8527087c1eead3f6.pdf
    • https://static.usrfiles.com/ugd/a838c0_86ecf40061a8413393236eabdb2e28f8.pdf
    • https://static.usrfiles.com/ugd/f103bb_f98f1d07af3e41eda4512a38b463698c.pdf
    • https://static.usrfiles.com/ugd/b8c837_716b483145c944f1824c43be34c6ec4e.pdf
    • https://static.usrfiles.com/ugd/3f0e57_addd0f0860ce485b9760830153e3fc07.pdf
    • https://static.usrfiles.com/ugd/726ec9_4f047777acc94cdb85482cc26b50aa2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_847600236a9d42ee85982da61d0b7367.pdf
    • https://static.usrfiles.com/ugd/286fb8_200eb267c18e4b4d83451bfb509a5466.pdf
    • https://static.usrfiles.com/ugd/253000_d9a394a9bf8f44a9bebc3600fd5836db.pdf
    • https://static.usrfiles.com/ugd/de60da_72c74b3e911943a491b602dde0558695.pdf
    • https://static.usrfiles.com/ugd/a1fb72_b9bed7a6a16341dea7506f905dadbc8a.pdf
    • https://static.usrfiles.com/ugd/e02969_4c4b4641057641e2bc93cc1cb024993d.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f64b48ba92745fcb58da6a16f35c53d.pdf
    • https://static.usrfiles.com/ugd/f46427_e1bd1e1488334ebf93dadee10172c103.pdf
    • https://static.usrfiles.com/ugd/0baf77_54e2260a37494354bc034f150f72f15b.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_off000067c0.bin
2673e832da5de6b90c43ffc98094851c8fe43ef49dd2e4e04ea502ced1daf82e
pdf-font-stream PDF embedded font (sfnt) at offset 0x67C0 4976 bytes
font_01_sfnt_off000078b2.bin
9dceaa95e32a679e95a9ae4f466b53c1ca1264d8d8a71b307de307f77c50fb05
pdf-font-stream PDF embedded font (sfnt) at offset 0x78B2 10252 bytes