Malicious PDF — malware analysis report

Static analysis result for SHA-256 661235e0955852a1…

MALICIOUS

PDF

48.2 KB Created: 2020-10-14 01:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: 04273ac12b13c1fc0b85c467e610a400 SHA-1: 7ed648327bd0ac171d20f3d597ae8b7a25842543 SHA-256: 661235e0955852a1f2e27338a923ad0658a485c531f9c36746871d4dbdf10ba9
194 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=curso+de+economia+em+pdf In PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/batagebexi.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/safado-fodidunixoso.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/mofep.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/nidisetati.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/xelikanotuzifaja.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/1/0437/5982/9149/files/dig_dug_achievement_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0638/6595/files/mutinawituxulanibov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4038/2362/files/46207457152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/160057a2-5804-411b-ab9f-ed933e52c137/88874746218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11875d59-45e4-4e02-a70e-58f6ee8e7d54/18451173593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e598c94-725a-4e89-a33e-65d775a77d92/dejib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eceea07d-3b2d-46e0-8bc9-9e9588cd8928/56057519700.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_off00007101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7101 5172 bytes
SHA-256: 52ceef8db58283a9b7034a5008af6d2c3ab79cc0a434d12f6a16d6da755d283f
font_01_sfnt_off00008276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8276 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00008b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B04 13332 bytes
SHA-256: 1e26d740c4151bb3406d0845407d508a32987754999a2fe33dcbf5077233df2c

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