Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f31996ff5ad5a08…

MALICIOUS

PDF

33.0 KB Created: 2020-08-27 15:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7f089ab8fe23df11587f997cfaf68c6 SHA-1: c5e309528bac371836b7bea4a1b2ecf31f5f003a SHA-256: 3f31996ff5ad5a08b9460bf9f9a85a2cb6e440988f48ff66e675e27f08a9c7c5
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify-hosted PDF files, which is indicative of a link farm. One of the primary links directs to a known malicious redirector infrastructure at ttraff.com. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be corrupted or obfuscated, but the presence of the 'green bay packers' keyword suggests a potential 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.com/pify?keyword=green+bay+packers-Spr%25C3%25BCche
    • http://files.suburbanmusicstudyclub.com/uploads/1/3/2/3/132302894/fifarijisorizawiwel.pdf
    • https://cdn.shopify.com/s/files/1/0437/1293/8152/files/pexisulaxidalugunu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3694/2234/files/61548333966.pdf
    • https://cdn.shopify.com/s/files/1/0431/7216/7841/files/68984183442.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/53480195611.pdf
    • https://cdn.shopify.com/s/files/1/0431/7744/3483/files/94568360567.pdf
    • https://cdn.shopify.com/s/files/1/0434/1376/6293/files/kopedoru.pdf
    • https://cdn.shopify.com/s/files/1/0432/7224/1310/files/20490189738.pdf
    • https://cdn.shopify.com/s/files/1/0431/5358/8390/files/2140854396.pdf
    • https://cdn.shopify.com/s/files/1/0454/7198/9918/files/maluzoxub.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/38148377942.pdf
    • https://cdn.shopify.com/s/files/1/0429/4311/9516/files/fedixenawupugeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jazaw.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_off00004195.bin
4826314f42769193b0ab3fec43e1617a4f8ec65dc3883649b212d5397ee9d9d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4195 5676 bytes
font_01_sfnt_off000054ba.bin
65117ab47e5514df5f94cbb9b8b0c5db1631ef7631c44753f1223ea83524fc9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54BA 9880 bytes

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