Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0dc42df36419377…

MALICIOUS

PDF

41.0 KB Created: 2020-10-21 17:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: ea92160ffb1dcf9c0607f3bbf836a2a0 SHA-1: 79cbbca3fe7651b0fe260bfd87fe9aaa3c251b17 SHA-256: b0dc42df36419377e4d4730380daabdeed849d4f95efbb82c35e901f841c2a9b
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=ap+chemistry+buffer+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375517/normal_5f89b9bb3cabe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_5f90169455dbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5f880b4a52560.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5f8f856004dcc.pdfIn PDF document text
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/debukikozedi.pdfIn PDF document text
    • https://gujodoludota.weebly.com/uploads/1/3/2/6/132681740/575cd0aae4f43.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off000061e7.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off000061e7.bin)
    • https://s3.amazonaws.com/leguvefu/gusuxokodekedamaruk.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/academic_writing_skills_cambridge_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/4545740298.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1fc7a88-cd64-480d-b4c2-7f54587d24ea/vixegaloza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b65925a-831a-4df1-8345-dff7318ab775/bofexupejetezugeg.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/bugejujebi.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/vujedavulivegogebi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7696/9157/files/risebodirevimi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8177/5287/files/74240444965.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4156/6105/files/dahon_speed_uno_bike.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_off000061e7.bin)

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E7 5384 bytes
SHA-256: 7d0dbde9cc7dfea13a7dffb00ae2dda342e1d4d4100f1ee3a9ea5d59c41505e9
font_01_sfnt_off0000740e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x740E 10452 bytes
SHA-256: ed62969e1758ecccb049cc96438b00900b5eb69d2cbcc20ce188a3576cca7f5e

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