Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8e23be91bb7d69…

MALICIOUS

PDF

44.5 KB Created: 2020-09-04 22:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf5d5bdbb36ac75661d564a299f029d0 SHA-1: 4a8cb17395dbcdc404228c2e90bc2125bdcddfd8 SHA-256: 0b8e23be91bb7d6906b420bdf541777f2b85a265a233f1c2563a87b3f0e7fbbf
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.me/wix?keyword=dallas+cowboys+printable+schedule+2018+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to disguise malicious content as a benign schedule. The presence of numerous other PDF links, many pointing to 'static.usrfiles.com', indicates a link farm strategy, likely to improve SEO for malicious content or to obscure the primary malicious destination.

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=dallas+cowboys+printable+schedule+2018+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/90423f_87efc59e32ed42c493caf8ac2ddd500e.pdf
    • https://static.usrfiles.com/ugd/9f69bd_8d0d552e0c6b47f689780290aff55575.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_d25eb68ea7d8471b849bd6bd79ce90a5.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tagitigupi.pdf
    • https://static.usrfiles.com/ugd/912de2_828ce471f52d4cdf9a80e589f34ac79c.pdf
    • https://static.usrfiles.com/ugd/69695d_4d48e88d37a643bbbe2eb2e96755ad00.pdf
    • https://static.usrfiles.com/ugd/f0b6b3_1f82107c62c94d9da894d0cef4dc841c.pdf
    • https://static.usrfiles.com/ugd/8716ab_28ac7724de79477d929bfb487df412c9.pdf
    • https://static.usrfiles.com/ugd/74e905_469fa8093dc4401ca97aaae9d9c95cb1.pdf
    • https://static.usrfiles.com/ugd/f6a907_e2a1e463fd9a40ee98663533c78fb11a.pdf
    • https://static.usrfiles.com/ugd/4dd980_0f2b21ccc75c4310a08b9e2c4d7a436b.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005891.bin
7a83abba6b65f83405812bf4b21135e710566aeb721ce855dd6c00518d43f92c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5891 6096 bytes
font_01_sfnt_off00006d5b.bin
ad6b7d89c5fa709855afe00301495b63a95e2ac7f715e2abd2fcaf396ca2e5f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D5B 2268 bytes
font_02_sfnt_off000077bb.bin
2151f01f70a75c71948cdb8677334d279b2f069e2e31a593d84a3d415449a745
pdf-font-stream PDF embedded font (sfnt) at offset 0x77BB 14688 bytes