Malicious PDF — malware analysis report

Static analysis result for SHA-256 53515f588a83989f…

MALICIOUS

PDF

61.6 KB Created: 2020-09-02 01:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9b7e81e3b3207c084722ed65835852c SHA-1: 95ad81908532fce2ca1d0bf5c4540a7591c65810 SHA-256: 53515f588a83989fbfe860ad195e49b7f47e35ccaf43d08c2b8cd9b4cdd675b4
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=html5+bootstrap+blogger+template'. The document body, though heavily obfuscated, appears to contain text related to web templates and includes the same malicious URL. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to 'static.usrfiles.com'. The ML classifier strongly flagged this PDF as malicious.

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.com/wix?keyword=html5+bootstrap+blogger+template
    • https://static.usrfiles.com/ugd/96768c_31258b1184fa45f3af674985d0004a00.pdf
    • https://static.usrfiles.com/ugd/b3bc21_e03a8b8c0c694de882cdafa1ed3f20ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_0b0f160955f34c62b2b221855a96307a.pdf
    • https://static.usrfiles.com/ugd/b8c837_e835c8c5d900456da26b5ef66bba75af.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b6d999c51a34c7996ee9ac66540983d.pdf
    • https://static.usrfiles.com/ugd/36f25b_6635a5b1bab9418e86d5309b3937a010.pdf
    • https://static.usrfiles.com/ugd/e5a943_8d95876a23df4190826ae5f9dcd4f189.pdf
    • https://static.usrfiles.com/ugd/f0e51d_f4b4c1dd433347e7b2f34876d29407d5.pdf
    • https://static.usrfiles.com/ugd/784815_695aef12fce0480791ecec21c28aafbc.pdf
    • https://static.usrfiles.com/ugd/82e28d_894d58c4d6524265ad4c4fb0ca96397a.pdf
    • https://cdn.shopify.com/s/files/1/0429/1503/7351/files/42831265349.pdf
    • https://cdn.shopify.com/s/files/1/0431/7354/4093/files/99155889377.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/jawagigezunoteged.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/
    • https://static.usrfiles.com/ugd/b8c837_0b

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3f3.bin
beba41eda33e2af7907cf84465ea5418db1471c6c3d950195cb1fcd3cc6fdfe3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F3 5364 bytes
font_01_sfnt_off0000c615.bin
07e2a3447a9005bea83c442c2a7d3e59f47e5d06a2da868029969e4c80ca4df7
pdf-font-stream PDF embedded font (sfnt) at offset 0xC615 10424 bytes