Malicious PDF — malware analysis report

Static analysis result for SHA-256 5505904969114ce9…

MALICIOUS

PDF

39.8 KB Created: 2020-08-19 07:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b3ec08b265efcb72ba8393a4bdad9a3 SHA-1: b79b0962c8bc1c5beb7d5aa70f1096d9b45ac8b5 SHA-256: 5505904969114ce9c55f4d990a465b391d7dd1d9264c5fda4ff282a286eab612
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as an 'Express VPN' offer. This link, https://ttraff.com/pify?keyword=express+vpn+for+pc, leads to known malicious infrastructure. The document also functions as a link farm, embedding numerous other PDF links, including one to http://sufiwukeg.infortifiedglobal.com/uploads/1/3/1/6/131607305/fufurezijabu.pdf, which is also suspicious. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.com/pify?keyword=express+vpn+for+pc
    • http://sufiwukeg.infortifiedglobal.com/uploads/1/3/1/6/131607305/fufurezijabu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9177/2063/files/sap_basis_course_content.pdf
    • https://cdn.shopify.com/s/files/1/0427/5847/1846/files/10608882452.pdf
    • https://cdn.shopify.com/s/files/1/0434/4836/9319/files/86819341581.pdf
    • https://cdn.shopify.com/s/files/1/0432/0267/4845/files/gurenedef.pdf
    • https://cdn.shopify.com/s/files/1/0431/5794/6522/files/regaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/1290/7427/files/febabetunajisivuvumuxilis.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8871/files/90165099173.pdf
    • https://cdn.shopify.com/s/files/1/0438/2566/0066/files/vitefiko.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_off000060d0.bin
6c6b8ce72645a4379b90f2377b2f7324c75a693dd8d065125ca15fc620eab555		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60D0 4852 bytes
font_01_sfnt_off00007172.bin
51cb3c89ca9bb8d2d00530e3459f8ee7440136ee6f053b43e29c0f30e7f873ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7172 9904 bytes

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