Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e90bf411d43f61e…

MALICIOUS

PDF

37.6 KB Created: 2020-11-09 15:50:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: 0de8d0a1d16b4acc5ce97d80cd1ea137 SHA-1: 1fad42e72d809fe6bed0986d001eb6072633dc22 SHA-256: 4e90bf411d43f61e553f595dde912170f13519bc96f5210630f5e54e01ad4545
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://traffine.ru/aws?keyword=synonym+for+eviscerated In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388046/normal_5f9b0d1c1a303.pdfIn PDF document text
    • https://norajaxufok.weebly.com/uploads/1/3/4/6/134611117/8861391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369302/normal_5f9727b8afb5b.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/bonupe_jetazamibogepu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404953/normal_5f9bc51a89d04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406482/normal_5f94c1afd506f.pdfIn PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/lojufizuzoziwakatu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374853/normal_5fa1f8319c704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385011/normal_5f91d1ebb84c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5f9b43d33c96a.pdfIn PDF document text
    • https://butiziro.weebly.com/uploads/1/3/4/3/134308177/e06147461e575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384150/normal_5f8fbd57a9852.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f839d05-55ed-45a6-9cd8-4d4a6bc2c5a1/9168202490.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_off00005223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5223 5400 bytes
SHA-256: d172d634ab0e658cb8994140a0953cc7ff4e42ddad30fea53f5bcf8bd5018a83
font_01_sfnt_off00006481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6481 11012 bytes
SHA-256: dbc355b3ecb8a8cebd6287984053ea27fba0ca437243aaf00c712351da6e0e5f