Malicious PDF — malware analysis report

Static analysis result for SHA-256 833035156f9d4ca9…

MALICIOUS

PDF

46.5 KB Created: 2020-11-01 08:03:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3d16bf1b2de9b749a51d3ca8dee8d4c7 SHA-1: 104deedf3da003d65facfa5caaf04926719e7863 SHA-256: 833035156f9d4ca94c24ab406b637b4e4a0785285d6dc36ccd0a4c4e6728a0d2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links pointing to external PDFs hosted on various domains, many of which are flagged as disposable or suspicious. One URL, https://cctraff.ru/aws?keyword=anatomia+completa+del+cuerpo+humano+pdf, is explicitly identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm or SEO manipulation scheme, potentially leading users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?keyword=anatomia+completa+del+cuerpo+humano+pdf In PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/1330473.pdfIn PDF document text
    • https://butiziro.weebly.com/uploads/1/3/4/3/134308177/9295275.pdfIn PDF document text
    • https://wesojejupeledaw.weebly.com/uploads/1/3/4/4/134446418/sudosewideroget.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393776/normal_5f9e28ab6531c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407314/normal_5f920c5935771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369183/normal_5f904148b36ac.pdfIn PDF document text
    • https://titawijuneve.weebly.com/uploads/1/3/4/0/134012454/teporanum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bugutaj/vesufunoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f511137-4463-4280-9c9a-aa6a387e2653/50752793367.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7498/5375/files/farmer_giles_of_ham.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/31130949349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b99ba0f-ec6b-47b1-86da-27c4b0306edb/71146839488.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/gijusatolurogubox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/5236/3676/files/nenev.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_off000074e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74E9 5204 bytes
SHA-256: 99e24a14808f119ea1fd7bb7f67bad5a05c53201c6e33a05a2b7113cabcce9d4
font_01_sfnt_off00008673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8673 11964 bytes
SHA-256: 7e4c30e35f584fd210fb38155255bab66d01bbc2aeb7d7e48f48f548e5259adb

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