Malicious PDF — malware analysis report

Static analysis result for SHA-256 841a4d3288d2dc4e…

MALICIOUS

PDF

45.5 KB Created: 2020-07-26 10:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4968f6628e631f4d0fd6d6440eeeaae SHA-1: ca12e8e21e14c762abfec401fe1a504b8701cbc3 SHA-256: 841a4d3288d2dc4e982f4e2a75b969a97ee37b3cc2229b7304d9e2b52a5eec52
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, identified as a link farm. One of the primary links, 'https://ttraff.ru/pify?keyword=apa+format+reference+online+article+no+author', is flagged as malicious and likely serves as a redirector. The document body, though heavily obfuscated, contains text related to APA formatting, suggesting a lure to disguise the malicious intent. 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.ru/pify?keyword=apa+format+reference+online+article+no+author
    • http://files.liveeatsweat.com/uploads/1/3/0/8/130874253/wifugidegar_wuwol.pdf
    • http://files.smartspraytan.com/uploads/1/3/2/8/132815298/batexosesimevab_gibidexir_ralenojujagaw.pdf
    • http://files.emapparelltd.com/uploads/1/3/1/1/131163666/77254c9.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nenixuraxolitater.pdf
    • https://cdn.shopify.com/s/files/1/0430/2811/9706/files/31591787850.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5208/files/puvuzepimimupovilij.pdf
    • https://cdn.shopify.com/s/files/1/0440/8950/7990/files/51031518805.pdf
    • https://cdn.shopify.com/s/files/1/0434/8107/1782/files/tisobimudoxamuxel.pdf
    • https://cdn.shopify.com/s/files/1/0433/2997/8526/files/vuwezowawilobakalinu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8466/1407/files/bapufevulifen.pdf
    • https://cdn.shopify.com/s/files/1/0439/9818/3582/files/25282573445.pdf
    • https://cdn.shopify.com/s/files/1/0431/3301/0081/files/retok.pdf
    • https://cdn.shopify.com/s/files/1/0428/0477/3031/files/roxusoraniwurajegiwuzurog.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5355/files/miborujinaramaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/6945/7063/files/fexamux.pdf
    • https://cdn.shopify.com/s/files/1/0431/6787/5221/files/bagiba.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_off00007579.bin
3484350ff2181561bf271dbd33d3a6bca3c722c012c151bcf3451b339017e77b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7579 4948 bytes
font_01_sfnt_off00008619.bin
9d543b2bb2218fb974bb983b3560e2c59fa6e7585a11fffe2b47dc8ea7db613c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8619 10060 bytes

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