Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b371fedc07b0b5e…

MALICIOUS

PDF

35.4 KB Created: 2020-08-22 09:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 057d71e5897387127009482a9f797af7 SHA-1: bfaf7fc10693bb7336716fc6efd88ea59b4d0546 SHA-256: 2b371fedc07b0b5ebc5adbe42047cbc401689c43f3af89f271563336727a1db8
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically to 'https://ttraff.com/pify?keyword=irregular+plural+nouns+worksheet+for+2nd+grade'. This URL is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and numerous other PDF links hosted on Shopify, suggesting a coordinated effort to distribute malicious content. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=irregular+plural+nouns+worksheet+for+2nd+grade
    • http://files.pursesbyleanne.com/uploads/1/3/0/7/130776131/9239044.pdf
    • http://zarupiv.vincentsgermanshepherds.com/uploads/1/3/2/3/132302868/2926444.pdf
    • https://cdn.shopify.com/s/files/1/0430/9457/3205/files/minilojuxezede.pdf
    • https://cdn.shopify.com/s/files/1/0431/9091/1137/files/zizufabel.pdf
    • https://cdn.shopify.com/s/files/1/0430/9480/2593/files/kumitozivirubileb.pdf
    • https://cdn.shopify.com/s/files/1/0440/5886/9910/files/mopun.pdf
    • https://cdn.shopify.com/s/files/1/0429/5278/6074/files/zetikodisavi.pdf
    • https://cdn.shopify.com/s/files/1/0436/4494/4542/files/45407247054.pdf
    • https://cdn.shopify.com/s/files/1/0430/4715/7911/files/gawesa.pdf
    • https://cdn.shopify.com/s/files/1/0433/9807/0435/files/9294255432.pdf
    • https://cdn.shopify.com/s/files/1/0428/9721/1558/files/45607347208.pdf
    • https://cdn.shopify.com/s/files/1/0434/8909/9938/files/2n3055_transistor_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/0381/3781/files/16462893135.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_off00004c09.bin
174d7d0d88b8d33bd0b6d31956cd17541c50ceba9188e7381c713c1067fff162		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C09 5528 bytes
font_01_sfnt_off00005ee1.bin
665520b8570e8f4ea89c5a629912525dd026fd44d969ff5cb791548fa4cc0faa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EE1 10156 bytes

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