Malicious PDF — malware analysis report

Static analysis result for SHA-256 db104ba40f8ed6f7…

MALICIOUS

PDF

42.3 KB Created: 2020-07-30 14:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c35fb67c354fdb680a8239c64c2c58d1 SHA-1: 20a920f45d6f4b5c5cae23e75f639984d5fdf6ed SHA-256: db104ba40f8ed6f7652c65f7c4a7bc35ac9a1346040ce0fc8983da1fe2b6c117
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body appears to be obfuscated or corrupted, but the presence of the malicious redirector and the link farm strongly suggest a phishing or malware distribution attempt.

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.cc/pify?keyword=accounting+standards+6+pdf
    • http://files.jessicalunn.com/uploads/1/3/2/6/132695519/7156711.pdf
    • http://files.algomaciofa.org/uploads/1/3/2/8/132815872/kijufipavijuni.pdf
    • http://files.downonthefreedomfarm.com/uploads/1/3/1/6/131607075/5396505.pdf
    • http://files.stpetetowtrucks.com/uploads/1/3/1/8/131856191/felobik.pdf
    • https://cdn.shopify
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/dalalebavujoremowa.pdf
    • https://cdn.shopify.com/s/files/1/0427/9674/4871/files/vezunaxudasekis.pdf
    • https://cdn.shopify.com/s/files/1/0430/3365/7507/files/33893704974.pdf
    • https://cdn.shopify.com/s/files/1/0436/8682/2053/files/80945559355.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/99369536060.pdf
    • https://cdn.shopify.com/s/files/1/0432/6352/5029/files/16066640033.pdf
    • https://cdn.shopify.com/s/files/1/0434/2936/3878/files/21095603358.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0656/files/43233263970.pdf
    • https://cdn.shopify.com/s/files/1/0434/0675/3948/files/75696333175.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/mutet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1261535930.pdf
    • https://cdn.shopify.com/s/files/1/0439/3772/6622/files/tanebejolebogawemujil.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_off00006963.bin
f696c3d5f2f62606c5f847e37fce85f3f3a48c6a2f63078b258a7d58bd3454f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6963 5196 bytes
font_01_sfnt_off00007b0a.bin
b6482475811c2af56b78f7b9d7d9215a2c35dd18056026c89a7ae5917b0b3ecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0A 9792 bytes

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