Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff35daea72838cf…

MALICIOUS

PDF

41.9 KB Created: 2020-09-19 19:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1d7231b82c79861178da3f667266ec3 SHA-1: 3ac64f34b12c957316d30487719298492f00bf2e SHA-256: dff35daea72838cf338e0cb0a102f0f04a12ef2302c8bde3b51c3294235992b4
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body text, though partially corrupted, includes the primary malicious URL, suggesting a lure for users to click through to potentially malicious content. The ML classifier strongly flagged this PDF as malicious.

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.club/wix?keyword=zeiss+contax+set+for+sale
    • http://xeleke.sailabilitybatemansbay.com/uploads/1/3/2/6/132696067/e3894.pdf
    • http://files.copelandconnection.org/uploads/1/3/1/8/131856574/2643010.pdf
    • http://timopujim.deartatay-paghigmata.com/uploads/1/3/0/7/130740450/teputiweba_buporerev_buwesojexafosu.pdf
    • https://f8b5eed7-c173-4e98-a600-5e0cfd2b64c6.filesusr.com/ugd/120874_60018441d85047bfb9649e1367f4245f.pdf?index=true
    • https://e5ed72c7-530f-4348-8128-d305441cbd9e.filesusr.com/ugd/24d943_617f315fb1684175bddfbf71cc04e4f6.pdf?index=true
    • https://71760685-6bb2-46ce-9e7b-3ebc8b860009.filesusr.com/ugd/1c44ce_406f0bdb13c14458b34b63a5dff3cb01.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/6971/0242/files/atmosphere_of_mars.pdf
    • https://cdn.shopify.com/s/files/1/0431/1023/6314/files/42362919328.pdf
    • https://cdn.shopify.com/s/files/1/0429/2545/7575/files/bank_preparation_books.pdf
    • https://cdn.shopify.com/s/files/1/0431/4044/8410/files/best_book_for_spring_framework.pdf
    • https://cdn.shopify.com/s/files/1/0431/6895/6565/files/fadelov.pdf
    • https://cdn.shopify.com/s/files/1/0437/7857/2450/files/80581437286.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mavadusuwavofemikedoj.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_off00006b25.bin
f7525ede1dbb2dc925969b06313dd4e3a51fed5e41a2ca93857450753aea14ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B25 4900 bytes
font_01_sfnt_off00007be8.bin
8e52505e694b7df0b2053a6771f91f683a6a23ec9aa173e64c43462fcafdd495		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BE8 9196 bytes

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