Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a4579e6a20c62d…

MALICIOUS

PDF

48.6 KB Created: 2020-09-02 16:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0870d086f7d3ee21d2e0afddca5d6710 SHA-1: 5f74786e2f5957dd0d65987b89ad86583caaaf55 SHA-256: a7a4579e6a20c62d49bf74f909c61b38d812344b8fdd963eb3d9241fde39102f
128 Risk Score

Malware Insights

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

The PDF contains a link farm with 24 external PDF links, many of which point to static.usrfiles.com. The primary malicious link, https://ttraff.cc/wix?keyword=ct+pistol+permit+application+form, is identified as a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'ct pistol permit application form' and the wkhtmltopdf application, suggesting a lure to trick users into clicking the malicious link. No scripts were extracted from this sample.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.cc/wix?keyword=ct+pistol+permit+application+form
    • https://static.usrfiles.com/ugd/b8c837_9cd1557c1c2947198157ca595f286777.pdf
    • https://static.usrfiles.com/ugd/ca300b_8dfd179c0e3742098a55d0f3bd39d84c.pdf
    • https://static.usrfiles.com/ugd/6812d7_6e75df0af52042d3bafdc1640bfdca4d.pdf
    • https://static.usrfiles.com/ugd/594ae5_358d4d4539494ce2a18a7f3206aebf0a.pdf
    • https://static.usrfiles.com/ugd/d01287_50ea89f6ff8d4ad5a6da96161a0add63.pdf
    • https://static.usrfiles.com/ugd/361045_51090f50845f4562b21b9d56a7095b79.pdf
    • https://static.usrfiles.com/ugd/856cea_9bea01977f92431ca77f279e26d8bd85.pdf
    • https://cdn.shopify.com/s/files/1/0433/3256/7195/files/niluvitopepejo.pdf
    • https://cdn.shopify.com/s/files/1/0462/0972/8665/files/renaissance_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/bovesejaraxexugetimeto.pdf
    • https://cdn.shopify.com/s/files/1/0432/8233/3864/files/past_simple_past_continuous_exercises_esl.pdf
    • https://cdn.shopify.com/s/files/1/0435/6007/5427/files/97518434019.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_off00008141.bin
2556672292bdb84bdbc41a03ab1ecef686bf0c630404ccc74481c6def546c4c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8141 5064 bytes
font_01_sfnt_off0000925b.bin
d96a34b296e2d53d073e8290b12c7f35e30a945c43ae0822b6dbea2a345312b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x925B 10352 bytes

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