Malicious PDF — malware analysis report

Static analysis result for SHA-256 be2759ca3fd48313…

MALICIOUS

PDF

39.3 KB Created: 2020-10-31 23:13:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 7d4b55580e670341953e4b0ed1bed174 SHA-1: 21508c390e9a069b108a9b46f5c1e16c771adbeb SHA-256: be2759ca3fd48313e09534f0744a8ac587f3186c05cf612e53d868af66cb5163
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/aws?keyword=duck+ringtones+free In PDF document text
    • https://bajusumuke.weebly.com/uploads/1/3/2/7/132741128/6891120.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/divizenisuxo.pdfIn PDF document text
    • https://nowakepofor.weebly.com/uploads/1/3/4/3/134369235/wilijo_gidokukereruzo.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/firokabiwepulawowu.pdfIn PDF document text
    • https://zatazonikafude.weebly.com/uploads/1/3/4/3/134340422/6788790.pdfIn PDF document text
    • https://natulawud.weebly.com/uploads/1/3/4/3/134309077/dufovukisezobera.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00005c29.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00005c29.bin)
    • https://s3.amazonaws.com/xafaxotaful/49541317120.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/37267066424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffd42f9b-c0da-47e9-8a38-c7ef0a8feb06/murekufolejekexuwe.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/big_easy_grill_accessories.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/knaack_tool_box_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/39255223271.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 extracted file (font_00_sfnt_off00005c29.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C29 4872 bytes
SHA-256: 70a82bf7c762c979c30d6d3a1ffe84c486a7fecce3e885a904992f3a581049ce
font_01_sfnt_off00006ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE3 10604 bytes
SHA-256: 4cfd14b9519e67da484954d1a2ca673f38527711a7bfbbc917d36ae98b4aac53