Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21821a172c37557…

MALICIOUS

PDF

41.0 KB Created: 2020-08-31 12:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d6d71bf4514888ac470bcbc22633850 SHA-1: b2edd160c3dc5d685f4af42688405f193ea25d3b SHA-256: c21821a172c37557153e3930cdf5adc596f8443bc80bb1d8f830881f3984a203
160 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a guide on downloading photos. The document also includes a large number of links to external PDFs, likely for SEO poisoning or to obscure the malicious redirector. The presence of a 'Password-protected archive handoff' heuristic suggests a multi-stage attack where the user is prompted to open a password-protected file, which is often used to bypass gateway security.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=how+to+download+photos+from+google+photos+as+jpegs
    • https://static.usrfiles.com/ugd/a48928_dd6301810ea14c18b7f7b4d7cfb4f393.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1af31325dd04060929ca47486efe374.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a468f04e5c04dbe9a25c268cdcf6777.pdf
    • https://static.usrfiles.com/ugd/b8c837_611caa82a29c45a59f7a9325be861f50.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc25def020a549a4badb8957350bcc05.pdf
    • https://static.usrfiles.com/ugd/a48928_87586509673e469b947802776a0a9bb4.pdf
    • https://static.usrfiles.com/ugd/edb4a7_65fb7a953e1c4e709c8ee1dbfbd149fc.pdf
    • https://static.usrfiles.com/ugd/738632_4372702b0abc420ba2e51767b8ceb913.pdf
    • https://cdn.shopify.com/s/files/1/0427/8750/4294/files/73656618149.pdf
    • https://cdn.shopify.com/s/files/1/0434/1720/6946/files/dirk_gently_s_holistic_detective_agency.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_off00006177.bin
912b81e7091b13ec0a15194e5a859d767b18bd7b4d7137f7315ce979385773d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6177 5584 bytes
font_01_sfnt_off00007462.bin
91239c8ccd2ae0c9302209fa940f49604f99541592f697d79445aaf7b59a27d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7462 10168 bytes

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