Malicious PDF — malware analysis report

Static analysis result for SHA-256 90caa72ae12c1686…

MALICIOUS

PDF

45.7 KB Created: 2020-11-05 06:19:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 77fea828d7231bc87a4d9809f323a181 SHA-1: e381620a5c5506ed7ae73c9b4741a0551b225aea SHA-256: 90caa72ae12c16865bcbcea8ff2f75eb63acc38f3fe5f1d67a329783275e22d9
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=remote+controlled+military+helicopters In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381738/normal_5f957e04e0706.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387408/normal_5f8d662a193b0.pdfIn PDF document text
    • https://wotapidedodibi.weebly.com/uploads/1/3/4/4/134475573/2e3310e38f7ae4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368999/normal_5f87dc218e4b3.pdfIn PDF document text
    • https://daletutanedura.weebly.com/uploads/1/3/1/6/131636587/db012.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5f89ef944383b.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/8dcc9118-e6d5-42e0-8503-77a52c05fa6a/why_are_scales_like_roadmaps_worksheet_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/badinerie_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/316944ff-af09-4bb9-8332-091ff451bb12/engineering_drawing_books_free_downl.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/bopemilaluzosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c318499-e1c3-4536-b101-15815c97943c/28253283135.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c25aa837-9d2b-43a1-96b2-530bc30894f5/rofoferete.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/19623377823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd8a616f-63ec-45e4-9a48-85f4a7ae4a72/jategad.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_off00007136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7136 5424 bytes
SHA-256: 4ebd687e333163496e0bcff2f5ad650751ad2241731535c85ca432fdf9adcde4
font_01_sfnt_off00008381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8381 11472 bytes
SHA-256: 6db6e38fa926903cb4a0aaed4370a3da62ba9aa26eaf930646444f87b64a99c4

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