Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5e5805bfbec084…

MALICIOUS

PDF

36.2 KB Created: 2020-08-23 21:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5cbc05ee85c493158339c3dcb19e4f6 SHA-1: 29463ddd693d2a9fd53cbb65e3089e360de93d39 SHA-256: af5e5805bfbec084cdf437a64b143b28a23201573fe0573e8c1ebbf01c22a4e4
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 SEO-optimized PDF files hosted on Shopify. One of these links, 'https://ttraff.ru/pify?keyword=hi+ho+silver+lining+sheet+music+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to sheet music and the malicious URL, suggesting a lure to redirect users to malicious infrastructure.

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=hi+ho+silver+lining+sheet+music+pdf
    • http://files.artrevthehub.com/uploads/1/3/0/7/130775679/xolozure.pdf
    • http://files.baytagoodah.com/uploads/1/3/0/8/130813846/8c6747d.pdf
    • http://files.lhseaglesbooster.com/uploads/1/3/0/8/130814960/gozikigoberaril.pdf
    • https://cdn.shopify.com/s/files/1/0438/1887/7085/files/bafimigirojigal.pdf
    • https://cdn.shopify.com/s/files/1/0433/9145/1303/files/ballade_pour_adeline_sheet_music_free_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1796/files/rakodoxagobo.pdf
    • https://cdn.shopify.com/s/files/1/0438/4541/9173/files/48982925835.pdf
    • https://cdn.shopify.com/s/files/1/0430/6681/8721/files/17661803548.pdf
    • https://cdn.shopify.com/s/files/1/0436/1800/9250/files/detogumapeto.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/22021058089.pdf
    • https://cdn.shopify.com/s/files/1/0432/1778/0896/files/47416576023.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jaxigosileworu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4666/6389/files/90951774672.pdf
    • https://cdn.shopify.com/s/files/1/0431/3926/8774/files/fisupitav.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_off00004d88.bin
cceac863e22f6f7c06ce0d225d08a03f95fc6ff661cf457cfc4428db6252c7db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D88 5380 bytes
font_01_sfnt_off00005faa.bin
4c1fed5aa3d01fabe46492421acb10720bc0e7f1716c4380ea49eab14d31d270		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAA 10592 bytes

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