Malicious PDF — malware analysis report

Static analysis result for SHA-256 365a25c47ceef8ed…

MALICIOUS

PDF

57.2 KB Created: 2020-09-10 23:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8dd1bb7ff9c26cbbbbe1e0cd0df018ce SHA-1: ab3914f17ee89ff5267e01ee43964492038774dc SHA-256: 365a25c47ceef8eda29a5c2bd138430241f9e2866fce47b63cfcf135b14ee9ea
120 Risk Score

Malware Insights

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

The PDF file contains a high number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One critical heuristic identified a link to a known malicious redirector at ttraff.club, which is disguised as a worksheet answer key. This suggests a social engineering attempt to direct users to malicious infrastructure.

Heuristics 3

  • 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.
  • 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.club/wix?keyword=rotation+and+dilation+worksheet+answer+key
    • https://cdn.shopify.com/s/files/1/0432/2505/5387/files/35621843414.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8190/files/57013371667.pdf
    • https://cdn.shopify.com/s/files/1/0430/5564/4823/files/advanced_accounting_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/8817/4497/files/15826183402.pdf
    • https://static.usrfiles.com/ugd/d90490_fc22b0fa16d14e399d3afa1f1a2a2ac1.pdf
    • https://static.usrfiles.com/ugd/5262df_6372bcd26f644c1d89b93e7c6ba0ceb4.pdf
    • https://static.usrfiles.com/ugd/bc84a3_bbbd511d5769419badb0bc8acddbefa8.pdf
    • https://static.usrfiles.com/ugd/5e81b9_a5b641be973a420998b1b97a6bb0d957.pdf
    • https://static.usrfiles.com/ugd/b8c837_fc8001a335954c0597ff760a643b0b0d.pdf
    • https://static.usrfiles.com/ugd/fac845_a5ce4676fc394bc184fa7ac72aa79102.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_off0000a1b1.bin
46713a827e85f26e929d5fe61d85934f2bbde8d13429b25be361dc8858b1a930		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1B1 5176 bytes
font_01_sfnt_off0000b35f.bin
efd82ed4e2719f3988ea535d631667350702880db1c4115d94a960c4503c22df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB35F 10772 bytes

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