Malicious PDF — malware analysis report

Static analysis result for SHA-256 4caa3e828e1f56b4…

MALICIOUS

PDF

43.9 KB Created: 2020-10-17 17:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 549af89f7fd307c00de2f26128c84f29 SHA-1: 71f4a444669bf681c4b65358e321fea6facc771c SHA-256: 4caa3e828e1f56b43b683ae0a301bdd9aa34577e234680b26498878431e3e72c
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.com/123?keyword=mathematical+expectation+examples+pdf In PDF document text
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/3178586.pdfIn PDF document text
    • https://wojedebaroz.weebly.com/uploads/1/3/1/6/131637691/roluveb.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/tuwobidudaxot_kuvoxa_livosejatat_rafedegoruf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380237/normal_5f8aae3393006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f8a0a10daa11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_5f8921b42c774.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5f8713d01db2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_5f871919b0f34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_5f8a08c2245c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f871eecc8ef2.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/ab9e9723-2a27-468c-af53-5cdac63b803e/gejulosirazemefana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5acf3d9-acbe-40ec-a6e7-15f99e5cdbca/noloxerejagovuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0acb7712-be9c-442b-993e-52c6396696a5/76150671562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fd7842b-9c72-4433-86c4-f99c62e8ea78/fugugifa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b58f035-1c56-47b4-8b56-d0be950f9e75/sorewidew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/929a46d6-7ae4-4164-bb41-f7e684ca804a/southeast_asia_treaty_organization_a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3ee55ea-1e80-4d33-8369-47d105d87ecc/87112802820.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9893/8778/files/vavobud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1478/1631/files/font_awesome_4.7_icons.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2815/9396/files/16622981311.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_off00006e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E4A 5372 bytes
SHA-256: 7a0c09701230f73955b1ae3d3150d457f302296ff88f9f17abf46582174b1588
font_01_sfnt_off00008076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8076 9948 bytes
SHA-256: abc1cf7b7818ff385247538d2a4c7c9aaed678ce816a3ef49ccb4c80c0a2465a

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