Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb26c1c6fcfd432a…

MALICIOUS

PDF

41.4 KB Created: 2020-09-06 16:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a796dfef12955fb16e9bcd191195e17 SHA-1: 1516491d29950fd62edfc73901e5759154b43aa1 SHA-256: cb26c1c6fcfd432a0fa7a75c289cf2e88360625c00ef567c8483a4a6d4aad602
120 Risk Score

Malware Insights

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

The PDF file contains a link that redirects to malicious infrastructure, masquerading as a "Gitea installation guide". The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the malicious nature of the redirector. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many of which are hosted on Shopify and static.usrfiles.com, suggesting a link farm designed to attract traffic. The document body contains obfuscated text and the target URL, 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.link/wix?keyword=gitea+installation+guide
    • https://cdn.shopify.com/s/files/1/0441/0517/1096/files/31402290348.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1123/files/grade_1_english_worksheets_printable.pdf
    • https://cdn.shopify.com/s/files/1/0432/7433/8454/files/94179415110.pdf
    • https://static.usrfiles.com/ugd/ae15ca_3be895048b4e4096b21422cde202dd6c.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_b5e96a8de0e04b979701b6e31519ab0a.pdf
    • https://static.usrfiles.com/ugd/b8c837_042007822ad24e519d279f0d3604b673.pdf
    • https://cdn.shopify.com/s/files/1/0432/1044/0862/files/sewanaxiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/9415/5169/files/corporation_bank_rtgs_form.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8311/files/attestation_formation_premier_secours.pdf
    • https://static.usrfiles.com/ugd/1be480_2f10241608c14a219bb50de5e23b51f3.pdf
    • https://static.usrfiles.com/ugd/739437_0ec199209c3a4fb9a0014fc316807079.pdf
    • https://static.usrfiles.com/ugd/c12414_fe16aaad93b84e8b9ad65be57be78136.pdf
    • https://static.usrfiles.com/ugd/b8c837_b807141955ef4b10b45a1f6f3750c3ad.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_off00006596.bin
06f5197263aeb57dc82738d091eb8cc70b8016065826ad87217e6d3d2f3af394		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6596 4928 bytes
font_01_sfnt_off0000766c.bin
b0256d4f691c9e28298263e1113e51e1f88f2a91d0cc6eb0c7d672aae20379d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x766C 10228 bytes

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