Malicious PDF — malware analysis report

Static analysis result for SHA-256 2550935900a4da2d…

MALICIOUS

PDF

39.4 KB Created: 2020-07-28 22:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9971c8dbabd51dea836cfb8115e631ae SHA-1: 66a4c31797694a9e3569b75b4da3046d6539ab1a SHA-256: 2550935900a4da2d14aed82f8e18b239de4e5d40eb16e61cb608af7f20a82305
150 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to a known malicious redirector. Additionally, PDF_SEO_LINK_FARM indicates a mass of external PDF links, with the primary one being a redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to movie subtitles, likely serving as a lure.

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=gangster+squad+english+subtitles+free
    • http://files.rsbismarkmd.com/uploads/1/3/2/6/132682739/pozotarobuwibopadux.pdf
    • http://files.highonfat.com/uploads/1/3/0/7/130739704/c8083d2ac54.pdf
    • http://files.paintedbrushstudio.com/uploads/1/3/1/6/131606984/pobezepiwikuxig_botubene_levazasevel.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48975286879.pdf
    • https://cdn.shopify.com/s/files/1/0435/1868/9432/files/xokovodogag.pdf
    • https://cdn.shopify.com/s/files/1/0429/8699/5863/files/rulopizimafanapunet.pdf
    • https://cdn.shopify.com/s/files/1/0430/9535/9641/files/497264586.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/33014415704.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0092/files/6717828429.pdf
    • https://cdn.shopify.com/s/files/1/0435/1537/9866/files/92805221247.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9477/files/63487515547.pdf
    • https://cdn.shopify.com/s/files/1/0429/3623/8236/files/nizirevufubo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4950/0328/files/32179767282.pdf
    • https://cdn.shopify.com/s/files/1/0431/6302/5567/files/57236923748.pdf
    • https://cdn.shopify.com/s/files/1/0430/7678/0181/files/koxitatorasuferozo.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/
    • https://cdn.shopify.com/s/files/1/0430/8

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a9b.bin
ab53eb903dbc13673ac6d0965ec6a64a9fde7188e68d16a19e0aa972974f02e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A9B 5240 bytes
font_01_sfnt_off00006c54.bin
4c08886da52822d02c90614978ae257303f04c83aa9b1cd50c858c7357fa3178		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C54 10564 bytes

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