Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e464d4d025e51cf…

MALICIOUS

PDF

38.8 KB Created: 2020-08-19 06:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7de3a487c3775ec2a0464c92cc7804d SHA-1: 40a9fb26c002463333046757cdf6f990e21fdf53 SHA-256: 8e464d4d025e51cf2545ba43cdf2fc3d5e85a6d009f75396abd203b04b647dab
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a link farm designed for SEO manipulation. One of the primary links, https://ttraff.ru/pify?keyword=wallpaper+3d++for+android+mobile, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious content. 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=wallpaper+3d++for+android+mobile
    • http://files.authorcharityayres.com/uploads/1/3/1/4/131437981/ziwilegavefur-zirenirama.pdf
    • http://files.shefaholistic.com/uploads/1/3/1/1/131163902/gimonimewog-napabef-madupux.pdf
    • https://cdn.shopify.com/s/files/1/0432/1152/2209/files/tetris_t_spin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67768868558.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/setixinojed.pdf
    • https://cdn.shopify.com/s/files/1/0430/1357/0709/files/zuvawo.pdf
    • https://cdn.shopify.com/s/files/1/0438/6629/2389/files/84613252923.pdf
    • https://cdn.shopify.com/s/files/1/0435/7311/7091/files/jamonesexebokanuxezenuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/9380/2646/files/72223554077.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/sides.pdf
    • https://cdn.shopify.com/s/files/1/0430/4705/9607/files/fefujad.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_off00005a41.bin
ccddb30230787dccf73d369b752fcaf8bf73f30047c4ea6dde861a9df999fa1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A41 5324 bytes
font_01_sfnt_off00006c50.bin
be6fb0e41c94448321905896a1d69196d7eebe1d5500fbaa976e14006a6e5e56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C50 9916 bytes

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