Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7ff7d3779b8af7…

MALICIOUS

PDF

44.4 KB Created: 2020-07-15 13:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4cc7f9da52b995d9049dc2e36025448 SHA-1: 49d2e2883ea0bb3178f7aecf57eb5f53a1bf8c54 SHA-256: 9b7ff7d3779b8af73c61b82ba5eae9fa6df45268610bd0a347f85451d24bf38a
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to attaching PDFs online. The presence of numerous links indicates a potential attempt to distribute malware or conduct phishing by directing users to malicious sites.

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.ru/wb?keyword=attach%20pdfs%20together%20online
    • http://files.lcisorchestra.com/uploads/1/3/0/7/130739970/dowiletamap.pdf
    • http://files.brandonmoorecomposition.com/uploads/1/3/1/4/131438766/muxigem.pdf
    • http://files.australianworkersparty.org/uploads/1/3/0/9/130969923/6164931.pdf
    • http://files.gcofc.org.au/uploads/1/3/0/7/130776647/nojokerudeb.pdf
    • http://files.msshackelford.com/uploads/1/3/1/4/131453198/b587bedf30.pdf
    • http://files.ninamariegardner.com/uploads/1/3/1/3/131384145/jififazavududariwani.pdf
    • http://files.archi-technology.com/uploads/1/3/1/8/131856624/d315fd62fe6942.pdf
    • http://files.chrisneohrunning.com/uploads/1/3/1/3/131379971/c5e50534e.pdf
    • http://files.debbiebakker.com/uploads/1/3/1/4/131437982/zesawut.pdf
    • http://files.chrisneohrunning.com/uploads/1/3/1/3/131379971/c5e
    • https://fuwedibet.files.wordpress.com/2020/06/xenatibiwe.pdf
    • https://tupawev.files.wordpress.com/2020/06/37234407862.pdf
    • https://defotikev.files.wordpress.com/2020/07/20544946400.pdf
    • https://pemifuxo.files.wordpress.com/2020/06/musatilu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6429/4557/files/34064339732.pdf
    • https://cdn.shopify.com/s/files/1/0430/0819/6767/files/62113604873.pdf
    • https://cdn.shopify.com/s/files/1/0436/8682/2053/files/famemosowubekopanex.pdf
    • https://cdn.shopify.com/s/files/1/0433/3774/4534/files/siwabena.pdf
    • https://cdn.shopify.com/s/files/1/0431/0230/6468/files/30707953428.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/nupopajajuzanufunitixeru.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/98708100623.pdf
    • https://cdn.shopify.com/s/files/1/0428/1306/3335/files/fijutin.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_off000070de.bin
c139ec660ed2754bceb59c54c21bf8b774be91e6f8227b9ed3b04e70816ab1c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x70DE 5196 bytes
font_01_sfnt_off0000827a.bin
e913411199689ec5d59896451c55dcde2515dbd8e479d9c0b0f990df78910f3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x827A 9888 bytes