Malicious PDF — malware analysis report

Static analysis result for SHA-256 377aa816c8fdec3b…

MALICIOUS

PDF

45.4 KB Created: 2020-10-25 09:45:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4798102cff454cd59913ca7ac1fd0a37 SHA-1: 9abf5cc44fef981330e6a217c0bc9a7b199d54d9 SHA-256: 377aa816c8fdec3bb018ab8625f078e0953a91e2ea6bf5c2206e8263690db408
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 a redirector service known for malicious activity. The document body also contains a URL that appears to be part of a link farm designed to lure users to malicious content. The ML classifier also 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://ggtraff.ru/123?keyword=runescape+2020+turoth+slayer+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5f89e6cfe3541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368736/normal_5f87bfd57779a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5f8c1fccba386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_5f9517b4e0a22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5f87b0861a68e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382619/normal_5f8c9852c0aae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388432/normal_5f8ff8b038b90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_5f8baa150d9e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369330/normal_5f91543f5af0c.pdfIn PDF document text
    • https://guratebiliwabop.weebly.com/uploads/1/3/2/6/132682790/0db84.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/mekupikoje-wizidi.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/6497588.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/1/0501/8235/7170/files/korg_mini_kaoss_pad_2s_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8039/2609/files/ascvd_risk_calculator_guidelines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6354/8325/files/25494991455.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/0427/8935/files/petojizusumewedigoti.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/mevuxosokutorivukozi.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/39060558185.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/wekojaribixuwezepumilomut.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/72077938148.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/embryology_ib_singh.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_off00006e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E32 5720 bytes
SHA-256: 708c6445894ee443bd09713d0a084142e402b7666c160304e02e5068bb7212d3
font_01_sfnt_off000081b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81B5 11316 bytes
SHA-256: 4847f54c90c9e4548d79282e8ef1d068ec1106e7b69018595d28cdeb07f9d121

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