Malicious PDF — malware analysis report

Static analysis result for SHA-256 b60352356c6cb1cf…

MALICIOUS

PDF

38.1 KB Created: 2020-08-16 02:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffe50838114f81b776aa6c65f2cab386 SHA-1: 9185d1b3a45edf3b15588ec2c25464aed766b600 SHA-256: b60352356c6cb1cfdc0d0ed0e1d48efc54f6ad35540dd74f6e9393ba59938f0a
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/wb?keyword=class%203%20maths%20worksheet%20time', is designed to lure users into clicking it under the guise of a math worksheet. The file also contains a PDF link farm heuristic, indicating a large number of external links, many of which point to Shopify domains, likely for SEO manipulation or to host further malicious content. The primary malicious IOC is the redirector URL.

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.cc/wb?keyword=class%203%20maths%20worksheet%20time
    • http://files.couplesretreatmarbella.com/uploads/1/3/1/6/131636725/2046884.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/16460313130.pdf
    • https://cdn.shopify.com/s/files/1/0434/4872/9766/files/59377998902.pdf
    • https://cdn.shopify.com/s/files/1/0430/2602/2554/files/83073818766.pdf
    • https://cdn.shopify.com/s/files/1/0428/7922/1927/files/99068418722.pdf
    • https://cdn.shopify.com/s/files/1/0437/3273/0017/files/pexijiwabivamep.pdf
    • https://cdn.shopify.com/s/files/1/0433/4046/4281/files/mumbai_society_bylaws.pdf
    • https://cdn.shopify.com/s/files/1/0438/3434/3574/files/36993812674.pdf
    • https://cdn.shopify.com/s/files/1/0433/8620/8406/files/bethesda_bug_report_fallout_76.pdf
    • https://cdn.shopify.com/s/files/1/0434/0357/5447/files/lutezejufir.pdf
    • https://cdn.shopify.com/s/files/1/0432/3095/3627/files/57269259721.pdf
    • https://cdn.shopify.com/s/files/1/0431/6240/2967/files/48899891120.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2088/files/vevaruzowevuligagol.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_off00005864.bin
88465e25ef79f5ba108aed941aa71708ee5aa1b105039d6547d59994a22daf3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5864 5152 bytes
font_01_sfnt_off000069d1.bin
c9922cba913a6e34e8022cdc162cb9f00442d73066d8cbb93803222f8c6b1c7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69D1 9992 bytes

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