Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8cf4ee05db3d5eb…

MALICIOUS

PDF

34.6 KB Created: 2020-09-01 12:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dff6690f6c3f31783e178bfeaf4491f3 SHA-1: 15a8cea2ef2227c5bf63f40cd49bfad0c85ba5dc SHA-256: a8cf4ee05db3d5eb4cac50daf63d953c2d20825ae8ad04decb7aba69eac7fcdc
130 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, which is indicative of a link farm. One of these links, 'https://ttraff.link/wix?keyword=birchdale+horse+form', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other benign-looking PDF links, suggesting a lure to redirect users to malicious infrastructure. 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.link/wix?keyword=birchdale+horse+form
    • https://cdn.shopify.com/s/files/1/0433/8204/6869/files/cancer_de_piel_en_perros.pdf
    • https://cdn.shopify.com/s/files/1/0431/0718/8898/files/bsc_botany_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0435/4274/1143/files/fundamentals_of_business_process_outsourcing_102.pdf
    • https://static.usrfiles.com/ugd/3b0c81_e1516e0a317a4ff5b8479f4e6a8a2fdd.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec31714a27b74abebb7d7c62c86ad74a.pdf
    • https://static.usrfiles.com/ugd/b8c837_c6150c041ccb4345925c5fd6b6871249.pdf
    • https://cdn.shopify.com/s/files/1/0428/3239/6447/files/lupofuduwifovefepovizemaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/5398/9534/files/5046859542.pdf
    • https://static.usrfiles.com/ugd/a474dd_5f82de92aff8442db6f7c8f3c8b3a736.pdf
    • https://static.usrfiles.com/ugd/b8c837_6fab0fb2f8284ee8a177317f2dddbf43.pdf
    • https://static.usrfiles.com/ugd/32acb1_ec351f4c67544741a7107d33926350fe.pdf
    • https://static.usrfiles.com/ugd/33a2e4_e1702940fd3e4b05bbcac8e54f54300b.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_off0000496e.bin
be2f8b14596c140edc9f10d8c90649861895415013b47c645347f19f9b239446		 pdf-font-stream PDF embedded font (sfnt) at offset 0x496E 5308 bytes
font_01_sfnt_off00005b54.bin
679bd82ab73136bdfa93634421423f3068202710eb99069265a916c6dfae4e9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B54 10236 bytes

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