Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f60679e75422dcf…

MALICIOUS

PDF

44.9 KB Created: 2020-08-07 14:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acb86cc611abdc3c85133220f259748e SHA-1: d5279d6329b9ee49ab0488a1569a4f85f3697898 SHA-256: 8f60679e75422dcfb69fab7e7609cc365f99c3736c007e4ef22affb6980f618a
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as a search result for 'pdf xchange editor free download chip'. This link redirects to malicious infrastructure, indicating a phishing or malware distribution attempt. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily corrupted, but the presence of a malicious redirector and a link farm is sufficient evidence.

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=pdf%20xchange%20editor%20free%20download%20chip
    • http://files.compellingministries.com/uploads/1/3/0/9/130970003/5f85f40e7e273c.pdf
    • http://vajivi.willardenvironmental.com/uploads/1/3/0/8/130874457/duritumozapido-jekakefikos-xokigowosokut-redifel.pdf
    • http://files.mgeducation.net/uploads/1/3/0/7/130775102/buditob-xanuf-zudofawedenaki.pdf
    • https://cdn.shopify.com/s/files/1/0435/2478/4283/files/tonomebukizuvut.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/xoduwixexos.pdf
    • https://cdn.shopify.com/s/files/1/0431/3415/6967/files/72278691347.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/90255486247.pdf
    • https://cdn.shopify.com/s/files/1/0428/5497/3606/files/funukefediwavugelel.pdf
    • https://cdn.shopify.com/s/files/1/0429/0658/3203/files/supuralibela.pdf
    • https://cdn.shopify.com/s/files/1/0430/3087/2215/files/mimuvefenusafofi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1688/7192/files/86375432287.pdf
    • https://cdn.shopify.com/s/files/1/0432/2269/6098/files/pavakagaterawepom.pdf
    • https://cdn.shopify.com/s/files/1/0433/0671/3253/files/11717518211.pdf
    • https://cdn.shopify.com/s/files/1/0427/8091/7926/files/keburuseluxofoxonito.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_off00006fbd.bin
e79aacedb08492143dc94cc728c773a5f4f365b408161839c079cc8ed8ff1024		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FBD 5400 bytes
font_01_sfnt_off00008233.bin
f95ff13309964c503d9c178d420991b77432200dc10d09428d6ebfc3c68d548c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8233 11096 bytes

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