Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b1890d4baa6259…

MALICIOUS

PDF

43.4 KB Created: 2020-08-30 17:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4511bc7e72907ace8699bb8d883573b SHA-1: 0a178ed4abd4711710cb46bdd5abca64ebfd520e SHA-256: f2b1890d4baa625999f1533382b04e720deaab09ae98bfcb794640fa9fe061e8
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 'ttraff.ru'. This URL is likely part of a phishing or malware distribution chain. The document also contains a large number of embedded links, flagged as a PDF SEO link farm, suggesting an attempt to manipulate search results or distribute content broadly. The ML classifier strongly supports the malicious nature of this PDF.

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=final+walk+through+checklist+for+new
    • https://static.usrfiles.com/ugd/f46427_7df89c23bbef42309a83c281871c51fe.pdf
    • https://static.usrfiles.com/ugd/c7a620_d41fbbd4e69c470e8896618e937813f6.pdf
    • https://static.usrfiles.com/ugd/99afdc_d9fb4945e967480b950057e26068330f.pdf
    • https://cdn.shopify.com/s/files/1/0437/2496/3990/files/advantages_and_disadvantages_of_television_advertising.pdf
    • https://cdn.shopify.com/s/files/1/0430/8792/1313/files/research_paper_template_powerpoint.pdf
    • https://cdn.shopify.com/s/files/1/0430/4984/4890/files/sebow.pdf
    • https://static.usrfiles.com/ugd/3aca14_e1a3b98bf2924f97adfe91b2c5edd444.pdf
    • https://static.usrfiles.com/ugd/2e79a6_f4148f62b36d4cc58cb497cdfaca9c02.pdf
    • https://static.usrfiles.com/ugd/93971e_021624f21a1341f6a073eb0876e47ec6.pdf
    • https://static.usrfiles.com/ugd/6240f8_2f7c44c4196d4d299a19e2ef8b2d6cb1.pdf
    • https://static.usrfiles.com/ugd/d55797_d7861cfedf7540db8ad3cfe8e57b49a9.pdf
    • https://static.usrfiles.com/ugd/2f7815_ab1ca4bb601149e9bb5d3ae2e86c4c97.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ee8.bin
7e42e5224ce7987b211f5889ec1e66973b46ddb20e9818562ccf0e4971d9120d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE8 5136 bytes
font_01_sfnt_off00007069.bin
7ca5252ab568ecebe71235bf3b47a1c894bd5ab96084c0bbe0ca095342653c0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7069 10108 bytes
font_02_sfnt_off000092ec.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x92EC 4324 bytes