Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd7c688d06e10b0…

MALICIOUS

PDF

39.0 KB Created: 2020-11-02 06:15:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 78a12b25d3274df1087648ca29304a04 SHA-1: 025a426775de115d5fa2a10a979ce60f21df2b0e SHA-256: 6dd7c688d06e10b055f5b64f5d5821328154b72bd2c296928548ad3c0f589d00
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.me/123?keyword=words+with+the+letter+b+in+it In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372983/normal_5f8aee0d1d675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5f88042f79f81.pdfIn PDF document text
    • https://luletifolavok.weebly.com/uploads/1/3/4/3/134369244/daxogenofuk-vepatil-viwer.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/f747ca2c-5a64-4270-be5e-9b880faeed69/jipidiwafitoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4ae9690-5194-4176-99b2-23e68fbd9703/4_virtudes_cardinales.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/62591868378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2e97930-c570-434b-8281-4912c449881d/cambridge_grammar_of_english_a_compr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2177202-0c55-4094-8f7d-3e68099a38e2/85000129626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b036da01-8671-4d8d-88fd-6938b4cb083d/43948324848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66b1cc7d-1803-4ec5-a390-2530dde390fb/50946192583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b86ee725-36aa-4122-920e-da0eb9643782/posesebelipabugozutit.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_off00005bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF1 4948 bytes
SHA-256: bf16ea5880a4db7754e08b511e42456376d693eef5c9638d675059f104c458af
font_01_sfnt_off00006cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD4 10220 bytes
SHA-256: f55f814b3577165aaa6379180dcbdae5f0928909bb35411ffa506fb9b53faff6