Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b6494cfbf6df49…

MALICIOUS

PDF

44.3 KB Created: 2020-08-18 21:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3e8668ae6af5b8853f57ffcf6047685 SHA-1: a422e3297e9e50d9c6350f82da5ea1f07e310faf SHA-256: 48b6494cfbf6df49877c7b508b58ac25d815315cd3bc034f046b3898befd1d74
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 pointing to Shopify domains, but one critical link directs to a known malicious redirector at ttraff.ru. This suggests a phishing or scam attempt, likely using the 'eight parts of speech review worksheet' as a lure. 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.ru/pify?keyword=eight+parts+of+speech+review+worksheet
    • http://files.howweglow.com/uploads/1/3/1/4/131409794/8407067.pdf
    • https://cdn.shopify.com/s/files/1/0452/6188/1506/files/tukekuwexuzu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5048/4390/files/vunelebomeb.pdf
    • https://cdn.shopify.com/s/files/1/0437/9898/6909/files/sikobobazevorefizavogiti.pdf
    • https://cdn.shopify.com/s/files/1/0431/3278/0695/files/57213823715.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/mfc-_l2700dw_driver.pdf
    • https://cdn.shopify.com/s/files/1/0428/5507/1900/files/jixelebegalegoxoropov.pdf
    • https://cdn.shopify.com/s/files/1/0429/9646/5823/files/cherry_tree_poem_by_ruskin_bond.pdf
    • https://cdn.shopify.com/s/files/1/0437/2008/1563/files/aptitude_questions_and_answers_with_explanation_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0428/2816/9375/files/26506849752.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_off00006f6a.bin
751c824cccf32b18c9d9a286fe93081c23293fe14f6ce205d1bf89eb104391cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6A 5416 bytes
font_01_sfnt_off000081f6.bin
cb70b0372dd540e699ef6b1cdbcfc641948ac72c7360ae66e8ba6d0c13027351		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81F6 10120 bytes

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