Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1afa32524739886…

MALICIOUS

PDF

36.8 KB Created: 2020-10-05 20:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 4d3cb172232bdec3c1028a3ea7f31485 SHA-1: 36b914c3fad55ba043c7ec3fcf2967109dee1f22 SHA-256: a1afa325247398861b8f9befd5cc1fd3202f8d7c164f11039d4d6178e2b635f3
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://ggtraff.ru/strik?keyword=pokemon+manly+pink+gba+rom+download In PDF document text
    • http://files.lucabenedetti.com/uploads/1/3/0/7/130776542/gavisagolawazoxi.pdfIn PDF document text
    • http://files.heartlandfeeding.com/uploads/1/3/2/6/132680915/ropozifokujolarutu.pdfIn PDF document text
    • http://files.itechtutoring.com/uploads/1/3/1/1/131164542/xodogepofumix.pdfIn PDF document text
    • http://tunoza.palmoilinvestigations.org/uploads/1/3/1/4/131454766/faebdffe5.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/20577827-f6a9-439c-993a-06365564702c/punafoxawofezazokepas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90128f01-8674-4589-ae5b-8491c26803b2/47437895652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24e85da7-67b4-4613-8380-dcad6807b812/81404993978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9239218-7045-4540-b5dd-17ef00c3e956/46780553084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ea6f015-6799-421a-8632-eafc7ea079fa/wobakotas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef6e356a-6d5f-4cda-8a3d-e3fdcff7ea2b/30265930198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c61e7b1a-253c-450a-b400-8c782dc725d2/23787086073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85fbaab8-1544-453f-ad28-953107c0ce2b/dotijadozefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ebbd171-328e-49e8-8239-fc14f85e48fd/mibutoruzusebupebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26112f90-759e-4d92-b917-76cc8932bf60/50268619390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60b0c635-cc88-4941-b9d7-6aeb934b026d/lojidirepofapelofigevop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b094cd94-6bb0-4768-bc86-db8dc590c3f7/18486803000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d8d88ff-a1a6-4581-a557-00157c8eca00/59222360574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a61c61bf-7501-44df-9e97-f7e70a1dc0c1/70252310474.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_off000050d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50D2 5500 bytes
SHA-256: 805b633a0e17775377a5f49676e279bcfca617e832bbcce5cf80fe0ba2a7a4ab
font_01_sfnt_off0000638b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x638B 10116 bytes
SHA-256: 54186160a73e562fcb24f212d9d938fe89eba23e10099aabf2bb6e3aa8ddd86d

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