Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b57c4ce68d09af…

MALICIOUS

PDF

40.4 KB Created: 2020-10-30 01:39:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: db83c57d16009660d0c2021c830fb9ac SHA-1: 7c73d67b419d28a073eed37ddb69a988b4da9059 SHA-256: 28b57c4ce68d09afd68c7e09911b0a50e56045e8b7230a6afcceacf30bb9b20b
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=ballad+of+jed+clampett In PDF document text
    • https://vomediwanuxorat.weebly.com/uploads/1/3/4/3/134327005/ce9cc4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00005f13.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00005f13.bin)
    • https://uploads.strikinglycdn.com/files/47b42001-6eff-4f5a-af49-94e3979f9387/eschew_materials_pathfinder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a67bfd2e-6a94-4fe4-98a0-d47af057965b/rizogatovafegizez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3969afa-6bab-4bbc-b6d6-50b8dc0ecf9d/bodyslide_mod_organizer_2.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/37011867822.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b944e44c-afb1-4c66-8f92-164a3869ec48/kawonul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68f2306b-e331-4fcb-94e1-4fe57eeb9c7b/whos_afraid_of_virginia_woolf.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/7275520923.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/856637e9-f429-4234-9d92-f0a2c81e09f9/99292337694.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/retukujun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71763c71-3c07-498f-b869-3b372f5aacaa/savuwimidikijazizuluman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7165b03-9158-4034-a395-eb68f19ed6f3/huston_smith_the_worlds_religions_free.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_off00005f13.bin)

Related samples 6

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_off00005f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F13 5152 bytes
SHA-256: b075ce26715a48792e7f748994d6a049de977248229e12c39a76e677baeb223b
font_01_sfnt_off00007095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7095 10824 bytes
SHA-256: 470701f7be8c1ec1f1d5b8429fec990ac400f34a5ab26f379432523977f211ce

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