Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c65f9ea5042484…

MALICIOUS

PDF

39.0 KB Created: 2020-10-29 15:56:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ad17264fed3f71bdda52b517d720124d SHA-1: 905b4893cdc65ca6be589b7cb62599bbe93510fd SHA-256: b8c65f9ea5042484064db16dfa4e4fe9031d1d5e7d9cf75865bc94b1f0397801
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate that the document is designed as a link farm, likely to distribute malware or lead users to phishing sites. The ML classifier strongly supports the malicious nature of this PDF.

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/aws?keyword=gerard+way+doom+patrol In PDF document text
    • https://kilejotiwig.weebly.com/uploads/1/3/1/4/131406519/924e3e7658e.pdfIn PDF document text
    • https://gekitudijelal.weebly.com/uploads/1/3/4/2/134265938/01b13227.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/3130584.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/jiwaxefegeja.pdfIn PDF document text
    • https://dojarugakafep.weebly.com/uploads/1/3/4/4/134471698/af3f769c13.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/778d260d-e376-411f-9b65-9b02e52db209/pawuxapomumobazuvonu.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/luvesizaxuwogizivimog.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/46590345750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00361ba1-21e8-4e11-9176-7b68a3172a0c/66337522894.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/70391514080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/650f0c0c-5533-4db6-8a30-e3d7e91e3fac/desa_specialty_products_doorbell_man.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/31948029590.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1892/7775/files/igi_2_covert_strike_android_games.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D09 4788 bytes
SHA-256: cee7ddc895e3f8acc5d9b128625d0c9cc6c436ffb36a0767dc1790dd518ddf4e
font_01_sfnt_off00005d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D72 10276 bytes
SHA-256: fa785d7a882db0c7f2f69cc9730a521d50cebf1c89b52ffc8c25eee2decb8846
font_02_sfnt_off000080cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80CF 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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