Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5a77444060647d…

MALICIOUS

PDF

44.5 KB Created: 2020-08-31 00:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7f86f144f18f025a7d00630cd268919 SHA-1: 528d10a28f372788686f1fc92fa824541fc89ed0 SHA-256: 7b5a77444060647da65b0bddd6433dd0b268e3dcf94f2212a94b00ba22fb3988
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed for SEO manipulation. One prominent URL, https://ttraff.ru/wix?keyword=the+greatest+showman+piano+sheet+music+free+pdf, is identified as a malicious redirector. The ML classifier strongly indicates maliciousness, and the overall structure suggests a phishing or scam attempt disguised as a document.

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+greatest+showman+piano+sheet+music+free+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_bad49abe751b4e6fbf4d31c8e0ebd9e1.pdf
    • https://static.usrfiles.com/ugd/6cf392_0fd8cd1e55324d3e94c2e3af57358b77.pdf
    • https://static.usrfiles.com/ugd/e32576_95a32f6982284f8e8021a99ca19f2de8.pdf
    • https://static.usrfiles.com/ugd/b8c837_beba4432736d44e8bebca1d18845bce3.pdf
    • https://static.usrfiles.com/ugd/bf650e_3a2f1d90ba7840b0bd7532a3144e01e1.pdf
    • https://static.usrfiles.com/ugd/3b0c81_e19a05baa9f54ed8aafce11f2685df07.pdf
    • https://static.usrfiles.com/ugd/b8c837_a538c46f3e7540e2b482ad1377d0217a.pdf
    • https://static.usrfiles.com/ugd/0047a4_ad40ad5636de47d39d82068a53989240.pdf
    • https://static.usrfiles.com/ugd/384ea4_237362efd5f2425fb4f1de4b4cf35ef2.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6ca1f5a16b04905a656077c5c3cbf9c.pdf
    • https://static.usrfiles.com/ugd/b8c837_8810646556304b8db3d75e64039a340e.pdf
    • https://static.usrfiles.com/ugd/f3cb45_09ac3b142a7b4e0ba16879892b9347c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_29d15258593e44d387c7d55473aceaf8.pdf
    • https://static.usrfiles.com/ugd/fd3290_e8633af5bcf44f059fb1100eef4d01c0.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_off00006e37.bin
4fc3aaec24853f29368174f670a68e0b379e2d756eff747b9da6d9e1e8e7edf4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E37 5576 bytes
font_01_sfnt_off00008123.bin
5f15b8115bc195a1ce4aa33ec81cb6019896cd347e744b854a83253d7dcc8dcf
pdf-font-stream PDF embedded font (sfnt) at offset 0x8123 10912 bytes