Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1337a3bf90b052c…

MALICIOUS

PDF

45.1 KB Created: 2020-09-12 00:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00c985c642f9ae274e28911244903d58 SHA-1: 42a488e5b80f3767b4af8618e7adfd5ade099ea0 SHA-256: e1337a3bf90b052c89f0517a2bc8c287651374af9e4f48ae2f43312ec077db1e
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF documents, characteristic of a link farm. One of these links, 'https://ttraff.me/wix?keyword=hollywood+reporter+best+film+schools', is identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The presence of a malicious redirector suggests an attempt to lure the user to a harmful site, likely for phishing or malware delivery.

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.me/wix?keyword=hollywood+reporter+best+film+schools
    • http://files.lifeword.nl/uploads/1/3/1/4/131408117/d394ee73a78e.pdf
    • http://betiv.vaalrivercitymarathon.com/uploads/1/3/0/7/130776433/beser-gexurob-soniva.pdf
    • https://static.usrfiles.com/ugd/32777b_14015992fb7b40cca32e572b74972c5c.pdf
    • https://static.usrfiles.com/ugd/a72fa8_41bc59a361474f9983c8de5ec81465f0.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_8b2f086f495449e2a3db1a6721c2581c.pdf
    • https://static.usrfiles.com/ugd/bf650e_01be0da26d0c4715bf936791d23ac7c2.pdf
    • https://cdn.shopify.com/s/files/1/0435/3916/9429/files/30856405275.pdf
    • https://cdn.shopify.com/s/files/1/0437/7663/9127/files/80064826248.pdf
    • https://static.usrfiles.com/ugd/a2d007_8d211f3e4b2f41beb9c092f251c7a507.pdf
    • https://static.usrfiles.com/ugd/b8c837_ddbbd5f0e68a4e4d8a973a8d228d58dd.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_off0000720c.bin
a91d6e9d735cdf57480dc1da4edf6b65318e783f4cc6b3ecf41f85ef5eec00ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x720C 5480 bytes
font_01_sfnt_off00008498.bin
ae7116b247af1182777ca096aaa65e136fdf90c8e49ebf24044aec904edd455f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8498 10408 bytes

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