Malicious PDF — malware analysis report

Static analysis result for SHA-256 994d51077659f93f…

MALICIOUS

PDF

43.0 KB Created: 2020-08-29 01:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e3132ce0eee6976020031973a8a21e6 SHA-1: f0f5306935ff70493d43297d762bd051cf586781 SHA-256: 994d51077659f93fad32936a9305333b7e1e720f56ac3f7ac4bc34cba454a8dd
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.ru/wix?keyword=the+comeback+louie+giglio+review'. Another heuristic indicated a PDF link farm with over 30 external links, many hosted on shopify.com and static.usrfiles.com, suggesting a broad distribution or SEO manipulation tactic. The document body, though heavily obfuscated, contains references to these URLs, reinforcing their role in the attack.

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+comeback+louie+giglio+review
    • https://cdn.shopify.com/s/files/1/0431/0119/2352/files/bekewulamavegokam.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/47348989818.pdf
    • https://cdn.shopify.com/s/files/1/0439/6072/9758/files/da_form_1059.pdf
    • https://cdn.shopify.com/s/files/1/0437/6946/2935/files/groundsheet_pegs_halfords.pdf
    • https://static.usrfiles.com/ugd/b8c837_c180215a48c347af82da553412fb9ca4.pdf
    • https://static.usrfiles.com/ugd/b8c837_399118f2549c40978629cf89fc0d8baf.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a1f5c131d9f4c5cbc50b2a8917f02dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ddb9238b4a44bd2b891773f8756251b.pdf
    • https://static.usrfiles.com/ugd/b8c837_d746cacea8cd4c9a86ccd86b9cf76171.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd612951ca1747b4a411d83b7988187c.pdf
    • https://static.usrfiles.com/ugd/b8c837_83e4c4ebe5e248818274c52a61ffd01a.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a7a3304c6474d6ca47f26549268ee81.pdf
    • https://static.usrfiles.com/ugd/b8c837_d22cdb9f5e104815a60ba5cfedbbd167.pdf
    • https://static.usrfiles.com/ugd/b8c837_ff71800600f04d48bc4a11439e45eafb.pdf
    • https://static.usrfiles.com/ugd/b8c837_5cdb85e260694944968d6c7e18b42741.pdf
    • https://static.usrfiles.com/ugd/b8c837_4bb78c9e5d064837b2103118abe422fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_e9d7e1a3d9c84f8cb019e7e42706f047.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_off000069aa.bin
6b833c7b9af570dfc0cac0a356098d87811dcb6f53778d9868f464405bbebdb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69AA 5340 bytes
font_01_sfnt_off00007bc3.bin
081af13ca815ea457bb9c7e27f84d852c81a5d82c643a021240cf56e3854bad5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC3 10724 bytes

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