Malicious PDF — malware analysis report

Static analysis result for SHA-256 38bb3266b771b734…

MALICIOUS

PDF

32.7 KB Created: 2020-08-28 04:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b22d0a9d93e0cd2fb2b541d81b87e5f7 SHA-1: 6500d35ce678eab1c860bd28a52468e9a823ff70 SHA-256: 38bb3266b771b734a89d7caaeb05e162ac71ca6e0c7626a354372609518f1955
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, traff.link, which is likely used to obscure the final destination of the malicious payload. The document body, though partially corrupted, contains the same text as the URL's keyword parameter, suggesting a lure related to 'vertebrates and invertebrates'. The presence of numerous links to Shopify-hosted PDFs, some of which are benign, indicates a potential SEO poisoning or link farm tactic to distribute the malicious PDF. The ML classifier strongly flagged this PDF as malicious.

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.link/pify?keyword=examen+vertebrados+e+invertebrados+1+eso
    • http://xipovoti.lqblackpool.co.uk/uploads/1/3/1/3/131380349/xemovaxixami_puvitukefe_ramifopoji_fomobamaki.pdf
    • https://cdn.shopify.com/s/files/1/0434/7002/8966/files/anatomy_bodybuilding.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/86621798893.pdf
    • https://cdn.shopify.com/s/files/1/0431/2255/7082/files/vukidelefuluz.pdf
    • https://cdn.shopify.com/s/files/1/0432/1561/8203/files/16466868099.pdf
    • https://cdn.shopify.com/s/files/1/0440/6440/7702/files/38905483913.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/bronchopneumonia_in_pediatrics.pdf
    • https://cdn.shopify.com/s/files/1/0428/8780/7129/files/raze_3_hacked.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8165/files/43284251295.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9670/files/38575302406.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_off00003f6f.bin
2f43bb489b0a9e7a3f335adf0557d6e5d1d5edbb5d82de56cae07e33ce154274		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3F6F 5216 bytes
font_01_sfnt_off00005122.bin
6b77302c48d4880887c47e6e69c25ccfdc74144f54eb8fcdc773209921d76276		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5122 10860 bytes

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