Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90c91c1bfa6c95e…

MALICIOUS

PDF

67.8 KB Created: 2020-08-23 09:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 8ef0d6f8cc756f25a7ec2eebe3fea0ad SHA-1: 252cbbee11a0846672603fe371adaf7781c991e5 SHA-256: d90c91c1bfa6c95eb6279a7bb8ecb202faf5f9911a0391b6a6c29c5388c98bdc
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://ttraff.com/pify?keyword=photoshop+camera+raw+7.+4 In PDF document text
    • http://files.ryanvasqueznyc.com/uploads/1/3/0/7/130775658/nibem-rijofuke-voruvolapilut.pdfIn PDF document text
    • http://files.ibyouth.org.uk/uploads/1/3/0/8/130874480/213368.pdfIn PDF document text
    • http://files.evernightdesigns.com/uploads/1/3/1/8/131857305/7353893.pdfIn PDF document text
    • http://files.loftconversionsderby.co.uk/uploads/1/3/1/8/131856039/dolijaxinivavaz-dubumonogadu-buxujogo-netuwamijukuna.pdfIn PDF document text
    • http://files.steppingstonebully.org/uploads/1/3/2/7/132740277/178beacfc54a29e.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/1/0430/9542/5191/files/86670894500.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7471/4790/files/91625708643.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/babape.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/antes_de_partir_libro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2639/0946/files/31098337025.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6958/8124/files/engineering_fluid_mechanics_10th_edition_elger.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8239/1451/files/virikisonupari.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_off0000bedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDC 5432 bytes
SHA-256: a2bd8c83a598953d712fc72371fcdeba9d7397a8227630ede8e09376d9f97b53
font_01_sfnt_off0000d156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD156 16000 bytes
SHA-256: 670c945c9018327d52730cc82c7f27555ae5f48c20a4ff5cf9beb4cc20e4d720