Malicious PDF — malware analysis report

Static analysis result for SHA-256 40bb6a386c227334…

MALICIOUS

PDF

37.5 KB Created: 2020-09-07 03:39:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d8e91324c1c090196ae79759cf6591c SHA-1: 264af921ee24437cfb1f080ff842b6fedb8389e1 SHA-256: 40bb6a386c2273342af5bd70e3e2bb7f69abc8525f347a907bbca36a51340a54
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with the primary link directing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.me/wix?keyword=statistical+process+control+excel+format', suggesting a lure to a phishing or malware distribution site. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.me/wix?keyword=statistical+process+control+excel+format
    • https://static.usrfiles.com/ugd/f241d9_7e2eaa71661347a09f056082bd95e115.pdf
    • https://static.usrfiles.com/ugd/4cf28d_1d89555b1809447d89fb4f7cff425565.pdf
    • https://static.usrfiles.com/ugd/8da65f_906bb87ad9ef404e8d60fb9927c5a299.pdf
    • https://static.usrfiles.com/ugd/b8c837_55a5e38445084e7081cc85053a2655ac.pdf
    • https://static.usrfiles.com/ugd/067ecb_20bffffc28f64eb28cadf7a5df6eea15.pdf
    • https://cdn.shopify.com/s/files/1/0430/6563/9073/files/sopa_de_letras_de_informatica_con_20.pdf
    • https://cdn.shopify.com/s/files/1/0436/1653/4690/files/94409502458.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/91256841386.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4749/files/begipovopujeregov.pdf
    • https://cdn.shopify.com/s/files/1/0429/9181/2767/files/weekly_cash_flow_report_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/5454/6590/files/saint_seiya_awakening_apk_taiwan.pdf
    • https://cdn.shopify.com/s/files/1/0433/5940/4197/files/nice_guidelines_unilateral_hearing_loss.pdf
    • https://cdn.shopify.com/s/files/1/0438/6163/9318/files/swot_and_pest_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0309/files/48542569565.pdf
    • https://cdn.shopify.com/s/files/1/0451/0951/0297/files/buoyant_foundation.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_off00005368.bin
eb6b0bef1aa7b81dd383dff5109e04de3c5b4f57b6c4d86f233d8234f589b12c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5368 5332 bytes
font_01_sfnt_off0000657a.bin
6d68d762e22d7d1d841461c500d75ce871ea1e174d4460501a3625736c83439e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x657A 10484 bytes

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