Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2d670517a3511b…

MALICIOUS

PDF

38.9 KB Created: 2020-08-29 05:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2589d5694265eb34dd25f1b508f21934 SHA-1: 929cfe637fa6daed2ee181be4234784f502a9f42 SHA-256: 6b2d670517a3511b20faa320a11ccc916a958caa3cb72e146cde26a3035dac58
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One of the primary embedded URLs, 'https://ttraff.com/wix?keyword=calculate+the+ph+of+the+resulting+so', is flagged as a malicious redirector. This indicates an attempt to direct users to malicious infrastructure, likely for further exploitation or phishing.

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=calculate+the+ph+of+the+resulting+so
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6371/2671/files/rudupejunozupozitumep.pdf
    • https://cdn.shopify.com/s/files/1/0440/2357/8774/files/sr_71_blackbird_fact_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/2788/9302/files/rawinud.pdf
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/28490266693.pdf
    • https://static.usrfiles.com/ugd/b8c837_0613e8e5969744308a8b6aa6976a128a.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd8067f5b2084320aa965e22ea9ccd1f.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f8e99e0d2064a16a84b997467f63680.pdf
    • https://cdn.shopify.com/s/files/1/0436/1306/1277/files/70073824708.pdf
    • https://cdn.shopify.com/s/files/1/0428/2915/2423/files/30440896694.pdf
    • https://cdn.shopify.com/s/files/1/0431/0751/6565/files/25480287507.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_off00005bbb.bin
6e35d91fa08d1962a655858d56bf86396f6721536948252b0d87c635534ca6eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BBB 5184 bytes
font_01_sfnt_off00006d53.bin
02ba98a10345e6d8bdf18ac5a464cf1f259615a0d4c8ca732d4b597606c05d76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D53 9944 bytes

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