Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cafcbe5e58cca13…

MALICIOUS

PDF

39.9 KB Created: 2020-08-31 19:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4360d95940cface2aad6543a6933b074 SHA-1: 4b03d385474734e0d980c723fa3c4a7e9c36b724 SHA-256: 8cafcbe5e58cca13a6430eaf58c66182d33af0247d97a0f86ad4873a716d11c7
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=mailbird+free+version'. This URL is presented within the document body, suggesting a social engineering lure to trick users into clicking. The PDF also contains a large number of external links, many hosted on Shopify and static.usrfiles.com, which is indicative of a link farm, likely to improve search engine ranking for malicious content or to obscure the primary malicious destination. The document body itself contains garbled text but includes the malicious URL and a reference to 'Mailbird free version', reinforcing the lure.

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/wix?keyword=mailbird+free+version
    • https://cdn.shopify.com/s/files/1/0431/4021/9041/files/item_ids_pixelmon.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5266/files/25150378693.pdf
    • https://cdn.shopify.com/s/files/1/0429/1523/3948/files/86412732949.pdf
    • https://cdn.shopify.com/s/files/1/0428/9078/9020/files/55277226179.pdf
    • https://static.usrfiles.com/ugd/6f58fb_1ef5fb1cb864469b8233aab741ba3b5a.pdf
    • https://static.usrfiles.com/ugd/510a18_5cda514d211d405abd60afba5e5fdaab.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c858a73eb3447a9b3c756bf73a9a67f.pdf
    • https://static.usrfiles.com/ugd/3e9e83_a8bb7601f8164f149c66307d3419923b.pdf
    • https://cdn.shopify.com/s/files/1/0437/1264/3223/files/cub_cadet_ltx_1045_manual.pdf
    • https://cdn.shopify.com/s/files/1/0460/3546/8452/files/76040735631.pdf
    • https://static.usrfiles.com/ugd/b8c837_4eff25d7850a40f7b91869aedce118a8.pdf
    • https://static.usrfiles.com/ugd/4c1554_8c3baf8e57a5430ca87ea82b75ddabec.pdf
    • https://static.usrfiles.com/ugd/8c2aca_c531b23212b14a2db3b73d4590222dcb.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_off00005f14.bin
353691babd50231347a2ccfb6ef1e67cca3f8222f14c32e424814a0e7c762cc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F14 5108 bytes
font_01_sfnt_off00007092.bin
e5c3d4a3d5d9353b17b95700fdf082ade2e1f6fe2a5a378f1f081de01b4f6256		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7092 10164 bytes

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