Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f32bb0fa4c339f…

MALICIOUS

PDF

39.7 KB Created: 2020-09-07 07:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d119f35f4820d51aad8493ee0ca1a5c3 SHA-1: 2ceed5ce10e9239e7b38d0ba336bff8172f83741 SHA-256: 38f32bb0fa4c339f45a86855bb3645b917d9bfb1d72af4f9bf503896f884f2d5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.me/wix?keyword=antiquity+journal+guidelines', which is likely intended to lead the user to a malicious site. The presence of a large number of external PDF links, many pointing to static.usrfiles.com, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly indicated maliciousness.

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=antiquity+journal+guidelines
    • https://static.usrfiles.com/ugd/61804c_4a5e95ceb7114b5290f3083f38c1e835.pdf
    • https://static.usrfiles.com/ugd/df73ab_0508b6d8d5f24f1b94cb738928641ac4.pdf
    • https://static.usrfiles.com/ugd/19103d_6e3eb6a22aa6473c9f37ea9c0886ec22.pdf
    • https://static.usrfiles.com/ugd/1a89c8_298daed78b834ad5896f580ac46be740.pdf
    • https://cdn.shopify.com/s/files/1/0430/7573/1607/files/jefubobudisipepenu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9139/3698/files/92679353362.pdf
    • https://cdn.shopify.com/s/files/1/0430/3391/9645/files/vafukizefizurelujifes.pdf
    • https://static.usrfiles.com/ugd/b8c837_def380d5552e418d82c97d6d4a3e69fa.pdf
    • https://static.usrfiles.com/ugd/67f5f7_421040c7441b47bbb318f0c7cf3de5c4.pdf
    • https://static.usrfiles.com/ugd/c83fdb_6c5723d648f54f23880aadb0102540d2.pdf
    • https://static.usrfiles.com/ugd/bb05c1_38cf9acce1384084a0e3791eee77d75c.pdf
    • https://static.usrfiles.com/ugd/d01287_e75bca3e0e3940769a12a1548d4fc492.pdf
    • https://static.usrfiles.com/ugd/5438e3_328a2b42248c4753b797a2f9aa510b55.pdf
    • https://static.usrfiles.com/ugd/3826db_52ac38cb9077402a971670efe83c0e46.pdf
    • https://static.usrfiles.com/ugd/027f51_3d3f2513ae56458c84f2402a2d00298f.pdf
    • https://static.usrfiles.com/ugd/ea2c45_9660cc890c1149e2b30a1598a67e5510.pdf
    • https://static.usrfiles.com/ugd/590778_8cad58547d31482286961e95659d65c4.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_off00004f70.bin
f05108d096a68181a102769f6eeac3adad042b052af2410e97e17ee0bfaec4de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F70 5168 bytes
font_01_sfnt_off00006110.bin
e2ed8da0c07b89ae9da757f52ddaf3e0bf6d1b361d80564dce796afaf303b31e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6110 10204 bytes
font_02_sfnt_off000083d3.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83D3 4324 bytes

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