Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1dec8d3182156e1…

MALICIOUS

PDF

39.8 KB Created: 2020-08-03 19:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a83deb438acaae702ef623c8bf88cf9a SHA-1: 2abb4c34931decba5c39ef5dbb052ffd78570b91 SHA-256: d1dec8d3182156e137fbcae2ba8b60847482c0dcea20cfa34913be7bab8540cb
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to external PDF files hosted on Shopify. One prominent link directs to a malicious redirector at 'ttraff.com'. This suggests the document is part of a link farm or SEO poisoning campaign designed to drive traffic to malicious sites. 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=knee+exercises+pdf+ortho
    • http://files.vaweather.net/uploads/1/3/2/7/132740249/5618142.pdf
    • http://files.bbpregistry.com/uploads/1/3/0/7/130776812/givuzikamagununaj.pdf
    • http://davatunir.avantgardedesignart.com/uploads/1/3/0/7/130775129/3188626.pdf
    • https://cdn.shopify.com/s/files/1/0440/6640/6550/files/rotimateb.pdf
    • https://cdn.shopify.com/s/files/1/0429/3243/7158/files/tobudefiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/1305/4357/files/3087922047.pdf
    • https://cdn.shopify.com/s/files/1/0435/3989/0327/files/11400901303.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1827/files/98500913843.pdf
    • https://cdn.shopify.com/s/files/1/0437/9338/3585/files/81153751320.pdf
    • https://cdn.shopify.com/s/files/1/0428/0814/8127/files/50614505326.pdf
    • https://cdn.shopify.com/s/files/1/0431/7937/6798/files/79677910768.pdf
    • https://cdn.shopify.com/s/files/1/0431/2550/6208/files/40495942173.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1223/files/womemitududuletiposivosi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4800/8866/files/31771408755.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_off00006058.bin
2e84dee8c5072c186e082979b63b187e35b27fea917916eefae51567b124a658		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6058 5040 bytes
font_01_sfnt_off00007188.bin
7638b1319e306fec64f881835dbd72956d5be45a25771fc675ca3689fc34eee9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7188 9732 bytes

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