Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c56b249530f7e2…

MALICIOUS

PDF

40.6 KB Created: 2020-08-31 04:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 584d69b7fd1e81562edef35d7b80224c SHA-1: 372aa0234a149cc7531b8a6431d7d5a402a62900 SHA-256: 15c56b249530f7e2b6adfe4f6919a69ffa9c67715f22d9b837e5b45f51997b05
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 external PDF documents, suggesting a link farm for SEO manipulation. One of the primary links, 'https://ttraff.me/wix?keyword=spectra+premium+radiator+review', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains this malicious URL and other PDF links.

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=spectra+premium+radiator+review
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_8bc0202a14354e588fc094bff3d3c6d3.pdf
    • https://static.usrfiles.com/ugd/432b07_41c11f3420234414aa029f210e7317a2.pdf
    • https://static.usrfiles.com/ugd/1ee69b_b3a1a1b48a8e4643a6cfaa0d62ff780f.pdf
    • https://static.usrfiles.com/ugd/625844_28a0f93d5af249efb92f99401c896d36.pdf
    • https://cdn.shopify.com/s/files/1/0428/5366/2883/files/66051946023.pdf
    • https://static.usrfiles.com/ugd/b8c837_afbbf7799a4b480da77fbf1ed771e870.pdf
    • https://static.usrfiles.com/ugd/b8c837_74d49489ccae40119cda99f384d04bb7.pdf
    • https://static.usrfiles.com/ugd/69695d_d0231332a87540bdbb5d1d660e3c90f2.pdf
    • https://static.usrfiles.com/ugd/e6092c_6606b0cf29ba4c4c989f4bab8739a177.pdf
    • https://static.usrfiles.com/ugd/b8c837_89a15ef2bbdf4668aa61d531536b533c.pdf
    • https://static.usrfiles.com/ugd/912de2_2dfdf2f3f0cb4e5c9fdbce7cd7cae134.pdf
    • https://static.usrfiles.com/ugd/79e0dc_52e14b0df2f64bc788e215ce2b712f3f.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_off000057cf.bin
9ed0448093fe454dec9a4dc7f982ca90fe85732f44f2e4a78b988297797af20b
pdf-font-stream PDF embedded font (sfnt) at offset 0x57CF 5264 bytes
font_01_sfnt_off000069ab.bin
6d567c398da5b99f372016fe2361963cc47002913eaaf423754b28d51796b1a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x69AB 13324 bytes