Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f38c05aa20dca94…

MALICIOUS

PDF

57.1 KB Created: 2020-09-09 02:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2047b33b1abfe4d9d510f792efee402 SHA-1: df1ac2a42401b43acb634ed37626663fa859888f SHA-256: 8f38c05aa20dca9409956543a2b310a1a2b503f0db4082e3a5475f2e7e1be7b4
200 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a free antivirus download, aiming to trick users into visiting a harmful site. It also presents itself as a password-protected archive lure, suggesting a multi-stage attack where the user is prompted to download and decrypt a payload. The presence of numerous external links, many hosted on Shopify, indicates a link farm designed to improve SEO for malicious content.

Heuristics 5

  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.me/wix?keyword=antivirus+portable+usb+free
    • https://static.usrfiles.com/ugd/430cb2_993adfcdd2b046a7a217c77e77df903b.pdf
    • https://static.usrfiles.com/ugd/565485_4accba5badec43128579cf325fa7140f.pdf
    • https://static.usrfiles.com/ugd/f4de5e_e69bf68b32fa4cd19a764f5a45fccd69.pdf
    • https://cdn.shopify.com/s/files/1/0434/1851/7665/files/jezal.pdf
    • https://cdn.shopify.com/s/files/1/0449/5550/0712/files/85236274587.pdf
    • https://cdn.shopify.com/s/files/1/0433/9020/6117/files/dremel_grinding_stone_color_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4434/files/jifuposugobabiselatug.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2536/files/kopikarik.pdf
    • https://cdn.shopify.com/s/files/1/0434/9699/7030/files/visualforce_developer_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4549/files/moment_js_format_more_than_24_hours.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/74021392312.pdf
    • https://cdn.shopify.com/s/files/1/0433/4823/0297/files/jalovalupop.pdf
    • https://cdn.shopify.com/s/files/1/0432/3131/4077/files/usmc_survival_manual.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_off0000a3bc.bin
bf9804e2bf3ae3313e69adf7a61c59a975431eee40cb61353bdfc441207c813c
pdf-font-stream PDF embedded font (sfnt) at offset 0xA3BC 5084 bytes
font_01_sfnt_off0000b51a.bin
267e64395f637d22fa3e31d9d70df7b6329831606e3cab766c320938bed5a272
pdf-font-stream PDF embedded font (sfnt) at offset 0xB51A 10144 bytes