Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a87eada9b6b6f2…

MALICIOUS

PDF

41.5 KB Created: 2020-10-25 19:33:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 7ed12813d578122f6ba424bba624f9d6 SHA-1: dd37502f717340704a4cccbc2fcfcb45b66d8b97 SHA-256: f5a87eada9b6b6f273a12dcd3e8f19d0ccd145aba543d1e1d28a9757b6079300
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=basic+english+grammar+module+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_5f91d21886e0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375071/normal_5f945684e3c43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369764/normal_5f9064829cd5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5f8c78fc1bbbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369522/normal_5f8b7fb82003b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370263/normal_5f8a293312be0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366620/normal_5f887f8362aad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369311/normal_5f8bfe50397d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372972/normal_5f8e38bdf0ed4.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/1/0482/2558/3258/files/39624894425.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/principles_of_agronomy_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/jitutomuzotademokuzojilun.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/vidolufaruw.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/sazalesowi.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/exploratory_data_analysis_john_tukey_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7819/8464/files/depukasidizoboduje.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/7677/8659/files/muhammad_ali_of_egypt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b01400-178f-4c27-87ac-ef7ea25a3427/mowupopogazunarewifif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f38913f5-3f9b-419f-af5e-aaae238609ce/vodujijaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9c402b5-dc87-426e-88f2-e41ed04461bd/microeconomics_a_contemporary_introd.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_off000061a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A1 5616 bytes
SHA-256: fb82ee38ef1dc9816cbb580a1b35e471bdd8b97167f1b988a41a77b6f43f5c3e
font_01_sfnt_off00007482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7482 10712 bytes
SHA-256: 11aedc7a5893f2c96bb167d76013ed316f4f08392d859f0b2835029eef496cad