Malicious PDF — malware analysis report

Static analysis result for SHA-256 1390a522aed851f2…

MALICIOUS

PDF

42.8 KB Created: 2020-09-03 05:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bbd433c2084bcd92d11d4720d9ad7310 SHA-1: bac45c39c288ad417dcb39d5d7ef0d535f1b9a59 SHA-256: 1390a522aed851f2d9ead42c4f173db2d74b2b06723af62ed32fcf8ded309f76
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, disguised as a tour guide advertisement. It also hosts a large number of links to other PDFs, suggesting a link farm for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.link/wix?keyword=amsterdam+female+tour+guide In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6667/1782/files/dofilisidoruwedakojide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9901/2766/files/juxazatafovifuxijakup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5149/1233/files/xijunokidovovevagewag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9736/6436/files/tagogavonudu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7750/1095/files/zokokuritekazinexi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/medical_billing_and_coding_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4557/6088/files/zobalujewaxij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/7736/1813/files/92727922955.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/1952/8348/files/justin_rose_witb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8100/6244/files/stanford_encyclopedia_of_philosophy_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6142/5814/files/7326562788.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8520/9512/files/75670524985.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9edd50_4d620210e4ca486083668f049ccfe8ce.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/726ec9_9dced3e687e441cdad3cb0ad9c664208.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5dc3ca_2dfb851d7c6a485096817fbf1848ce9b.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68B6 5216 bytes
SHA-256: 06d92fdc3ec4eeb9aff67c7e38c9de2f78402609ecc180a9d5edde39ad24075d
font_01_sfnt_off00007a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5F 10544 bytes
SHA-256: 6c99da8496a9f5ce49a3edf097c9eff85a3bd8c54c56427e30573c1119c84d82

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