Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d67e1d123aa60f…

MALICIOUS

PDF

40.5 KB Created: 2020-08-31 03:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7304423a596b9d3c7bac89d550d137b7 SHA-1: bddf796ab6a5c36a1d785542770dfbc35b4a112a SHA-256: b3d67e1d123aa60f3cc4f533771dec587a0350ec401e8b26d1a33db447c92586
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=core+language+score+celf+5'. This URL is likely the primary mechanism for delivering a malicious payload or directing users to a phishing page. The document also contains numerous links to external PDFs, flagged as a link farm, which may serve to obscure the malicious redirector or distribute further content.

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/wix?keyword=core+language+score+celf+5
    • https://static.usrfiles.com/ugd/c7ef1a_7e1e0b4643484817b7ccb687f62c63fe.pdf
    • https://static.usrfiles.com/ugd/0ebc1f_6a01b5a03b8146e88678dd83737a3f1f.pdf
    • https://static.usrfiles.com/ugd/50c35f_62cbed242ac74e4eb828264362fabae2.pdf
    • https://static.usrfiles.com/ugd/63022f_ad318854a1f94bb7989abe082ef0b49a.pdf
    • https://cdn.shopify.com/s/files/1/0432/3760/5544/files/voxika.pdf
    • https://cdn.shopify.com/s/files/1/0440/5516/7126/files/archery_mod_apk_unlimited_health.pdf
    • https://static.usrfiles.com/ugd/e02969_f952ee95eb30492ca6148abce691e054.pdf
    • https://static.usrfiles.com/ugd/b8c837_54c459351c834a83856c2cc260e67734.pdf
    • https://static.usrfiles.com/ugd/0c4177_7b685406cf4d4709984d381d32ae6b19.pdf
    • https://static.usrfiles.com/ugd/b8c837_6183246d100d46d28dc6b95d7a1db236.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_off000060f4.bin
5667d50130c17d41d1031a59de3c5a81b2ee7317efaa80f1b19494693af68e51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60F4 5076 bytes
font_01_sfnt_off0000724f.bin
3ab383c62ddddf9e51e772faa0eabfe9028ca6040a2421badc31d30a9ffba8ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x724F 10360 bytes

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