Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ea5c56ffe21424…

MALICIOUS

PDF

43.5 KB Created: 2020-09-01 03:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac7a668f012f5074e6430c1d983234dd SHA-1: 8c27ca00a4c61457734e84274726f8e3ee8638a4 SHA-256: 51ea5c56ffe21424cd701a72bbd24e50957158c1438f3246962d5faed0b45bd3
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=count+sheets+in+a+workbook'. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous external links. The document body, though heavily obfuscated, contains references to urgency lures, suggesting an attempt to trick the user into clicking the malicious link. No scripts were extracted from this sample.

Heuristics 4

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=count+sheets+in+a+workbook
    • https://static.usrfiles.com/ugd/0d002d_5b3e9d3a2fce48339a4b6eeb45ec089b.pdf
    • https://static.usrfiles.com/ugd/b8c837_585e8478dc684b0b9b27ade8e9e7a858.pdf
    • https://static.usrfiles.com/ugd/e78b77_48d03a07fd2f44f38e17781566846ae9.pdf
    • https://static.usrfiles.com/ugd/2e16aa_a9fbf41e8c37412fb3b1c097a8378e42.pdf
    • https://cdn.shopify.com/s/files/1/0429/8702/8641/files/propiedades_de_los_metales_alcalinoterreos.pdf
    • https://cdn.shopify.com/s/files/1/0433/6045/2760/files/9179293787.pdf
    • https://cdn.shopify.com/s/files/1/0430/9729/2967/files/64411189547.pdf
    • https://cdn.shopify.com/s/files/1/0435/0597/5462/files/duck_mill_lawrence_ma.pdf
    • https://cdn.shopify.com/s/files/1/0433/4783/7083/files/tidenoguwu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9437/6599/files/49889923428.pdf
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/56593761248.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8178/files/57293308643.pdf
    • https://static.usrfiles.com/ugd/24853a_0a406c5a6157461aa4ddfd248529dd4a.pdf
    • https://static.usrfiles.com/ugd/d94ae5_26ef815a2afd4b118ffbf649a448452b.pdf
    • https://static.usrfiles.com/ugd/33a2e4_526af1216ab24f20b7259239e6f47eda.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_f7c23fa8fbbb455fa1be984f3de8c479.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_off00006bb1.bin
2e83983f274646e00559e1a7e2994b7010bb90bfea0cfa8cf5ccdcbffaf2af62
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB1 4944 bytes
font_01_sfnt_off00007c87.bin
2e380ae7f82f49005b99140b5620d7f8fa90095c9076b3264d1d6640a24a31a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C87 10804 bytes