Malicious PDF — malware analysis report

Static analysis result for SHA-256 b050318e71dd8c9b…

MALICIOUS

PDF

36.7 KB Created: 2020-07-27 15:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6203a3791d45891cfc019e8e3747947 SHA-1: b4b27ea15348fa8cadf888911d521968df76de78 SHA-256: b050318e71dd8c9bfc28f41df24bf1e4fdea5e55ae9c93bfb6f32846b27ecc58
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. Additionally, it features a PDF link farm, suggesting an attempt to drive traffic to external sites. The ML classifier strongly flagged this PDF as malicious. The embedded URL points to a redirector that appears to be part of an SEO poisoning or phishing campaign.

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.com/pify?keyword=bixby+home+apk+android+9
    • http://files.mybnponline.com/uploads/1/3/0/7/130776073/rewaweb-nexutakaserisex.pdf
    • http://files.mysonthesuperhero.com/uploads/1/3/0/7/130738876/fb44b1c4a.pdf
    • http://files.moirconstruction.co.uk/uploads/1/3/2/7/132741535/rikojabup-pisuzumenoguko.pdf
    • https://cdn.shopify.com/s/files/1/0434/5433/3093/files/55093247966.pdf
    • https://cdn.shopify.com/s/files/1/0436/6345/8457/files/91913241242.pdf
    • https://cdn.shopify.com/s/files/1/0429/3741/7887/files/26117706431.pdf
    • https://cdn.shopify.com/s/files/1/0435/4365/8650/files/widejakatewibuz.pdf
    • https://cdn.shopify.com/s/files/1/0439/8622/3262/files/23720708125.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nakoximowukod.pdf
    • https://cdn.shopify.com/s/files/1/0439/4477/1739/files/gojavilogasemoxobani.pdf
    • https://cdn.shopify.com/s/files/1/0428/5746/3971/files/98412004290.pdf
    • https://cdn.shopify.com/s/files/1/0433/8201/4108/files/79085288264.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1796/files/62622844611.pdf
    • https://cdn.shopify.com/s/files/1/0432/5117/1478/files/69289274566.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_off00005399.bin
1b11173908f93e5d2dc1b4b6db49e2b390c92609424b2909bac4e2b8de9dd0a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5399 5276 bytes
font_01_sfnt_off0000654b.bin
7c4661416fb76a59c77785bc26d3cab0adeb2ad1782bd77615e9d21446177b27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x654B 9548 bytes

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