Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c78991eb81c6ac6…

MALICIOUS

PDF

47.6 KB Created: 2020-10-21 01:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: aa1da4b144e0858cfc72f6f59d3f1d59 SHA-1: adba0a47d1b825ef4e75d864dfd15c15828e426c SHA-256: 6c78991eb81c6ac6b3dc84e5b612e148a69c663ccd73a81e64753511c49ad5f2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure users to malicious infrastructure.

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://cctraff.ru/strik?keyword=calcul+mental+nombres+d%25C3%25A9cimaux+cm2 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370560/normal_5f89d91e18c40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387242/normal_5f8e4a24726ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371004/normal_5f891e7c69dca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f8731a438031.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367642/normal_5f8a41d8ab7a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_5f87a359cf771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_5f86f4eb46b0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_5f8b3d7612370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381318/normal_5f8c9ac8c1db6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369920/normal_5f8a09267a321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374002/normal_5f8b7794e5de0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5f8d4be8ba4a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376854/normal_5f89f22a8524d.pdfIn 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/1/0431/2658/7549/files/progressive_era_reforms_timeline.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/1728/3995/files/torchlight_apk_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9245/8139/files/79957312942.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7663/9127/files/zoxinajofuridewozoramarex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0243/6512/files/24375863987.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/88328496800.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/9938470704.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_off00006b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B8E 5472 bytes
SHA-256: e0557d5c05b2634701a655e9d66140b4bd30483285b0a234cfbc36ff2c4ef7be
font_01_sfnt_off00007dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC5 16484 bytes
SHA-256: 61691d71732d00ad050c384aa6045ee6607d42eaae3d51071886379961a80026

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