Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d9f7b98d411662…

MALICIOUS

PDF

48.9 KB Created: 2020-08-15 05:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b722456b27e3528a41e240429f4c425c SHA-1: d6ea98f20c45d48f9d7052cd11d93deeb72e8a1e SHA-256: 26d9f7b98d411662c94ed46ccf8416b456f853a9898060fa1a3b2849f1ac8df2
150 Risk Score

Malware Insights

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

The PDF contains a link farm and a direct link to a redirector, both associated with malicious activity. The primary redirector URL is 'https://ttraff.ru/pify?keyword=vpn+free+android+unlimited', which is designed to lure users with a promise of free VPN services. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's designed to host and distribute links to other potentially malicious PDFs.

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/pify?keyword=vpn+free+android+unlimited
    • http://tukego.ikorta.com/uploads/1/3/1/4/131437679/wurivo_sosadak.pdf
    • http://lodin.joanneholtje.com/uploads/1/3/2/6/132683014/4a81410f.pdf
    • http://nivixakad.charlotteponyclub.com/uploads/1/3/2/3/132303382/posometu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0503/files/zazewewewavedobojewow.pdf
    • https://cdn.shopify.com/s/files/1/0450/7149/9416/files/65811559270.pdf
    • https://cdn.shopify.com/s/files/1/0438/4771/2928/files/morinimonosobarug.pdf
    • https://cdn.shopify.com/s/files/1/0437/0356/6486/files/memibibu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7365/0334/files/sling_psychrometer.pdf
    • https://cdn.shopify.com/s/files/1/0440/4389/4934/files/66587775957.pdf
    • https://cdn.shopify.com/s/files/1/0434/3683/4981/files/english_language_proficiency_thesis.pdf
    • https://cdn.shopify.com/s/files/1/0431/7973/7237/files/74780631468.pdf
    • https://cdn.shopify.com/s/files/1/0432/0873/6928/files/dezetugagiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/3342/0195/files/f_scott_fitzgerald_bernice_bobs_her_hair.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4498/files/57183246049.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_off00008258.bin
dc529970ad82fcbe78baf6be06de36665f87c7d451fa963528c71beb97fea436		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8258 4972 bytes
font_01_sfnt_off0000932c.bin
ed497fc83f77490badc72e1418a61df871e4d49be27b1049405da3272762cebd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x932C 10364 bytes

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