Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73b522b11e4fc54…

MALICIOUS

PDF

48.0 KB Created: 2020-07-10 05:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50705dc34fad2b2ad6967cbed3957429 SHA-1: a321417040af42ff4212a24470aeb86ccd838b9b SHA-256: e73b522b11e4fc546eb9515894e86e7c3a583f6818caec178e52d3bf1dd39a0b
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary URL identified, https://ttraff.ru/wb?keyword=karnataka%20b.ed%20cet%20question%20papers%20pdf, is flagged as a malicious redirector. The document body, while containing garbled text, also includes this URL and other links to PDF files hosted on various domains, suggesting a social engineering lure to disguise the malicious redirection. No scripts were extracted from this sample.

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.ru/wb?keyword=karnataka%20b.ed%20cet%20question%20papers%20pdf
    • http://files.causewaysecuritysolutions.com/uploads/1/3/1/3/131384492/0c3339e4b7dc.pdf
    • http://files.ducksnestdecoys.com/uploads/1/3/0/7/130775025/jiviwivapebe.pdf
    • http://files.glaciercitygardener.com/uploads/1/3/2/6/132695343/34ad3b.pdf
    • http://files.sebgarry.com/uploads/1/3/1/6/131606173/tuvujefotofegu-wigelipopopiru-newavutofibipag.pdf
    • http://files.northernnerd.com/uploads/1/3/1/3/131379680/wobifopedufinu_beruwedorelixif_kugepa_gakofus.pdf
    • http://files.strayashop.com/uploads/1/3/1/3/131379262/1733797.pdf
    • http://files.opunakesurflifesaving.com/uploads/1/3/0/8/130814513/gezitowejukejekojuko.pdf
    • https://bobonuw.files.wordpress.com/2020/06/29983857904.pdf
    • https://divezifek.files.wordpress.com/2020/06/32185965760.pdf
    • https://xojezetegako.files.wordpress.com/2020/06/gonokuzo.pdf
    • https://puvabuv.files.wordpress.com/2020/07/37259585868.pdf
    • https://fabewazuzej.files.wordpress.com/2020/06/lewokugupenopedes.pdf
    • https://samebixera.files.wordpress.com/2020/07/11313907818.pdf
    • https://vafetojo.files.wordpress.com/2020/06/82465853742.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8003629611.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rojifibopi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37872338034.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kexuxedixu.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_off00007cac.bin
89d48d46ca07600d503fa441d4294e0770b8c6f14defa97251493dc5865c6b22
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CAC 5332 bytes
font_01_sfnt_off00008ed3.bin
f1f89a7cd48bd64bd142e7acd61c8d2e4951d76cd0f94ff24cb3f4bcee82f9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED3 10608 bytes