Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ea7076bb89b52d…

MALICIOUS

PDF

41.8 KB Created: 2020-10-09 09:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 1b84474f9ad83ab5ffaa8099b768e9c5 SHA-1: b3825812ffefcde7529b72ef001aea0a6d7162c4 SHA-256: d8ea7076bb89b52d218dc408ab87f3bf5a64631dc9f1d2cf8b768802b62e59ba
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://gettraff.ru/strik?keyword=hermann+hesse+siddhartha+trans.+by+joachim+neugroschel In PDF document text
    • http://wuketub.heathermakesadifference.org/uploads/1/3/1/6/131606008/zusanafif.pdfIn PDF document text
    • http://files.albernibasketball.ca/uploads/1/3/1/6/131606854/6573433.pdfIn PDF document text
    • http://files.endymienne.com/uploads/1/3/1/4/131438142/fadegi-pobebun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4987/6641/files/there_goes_a_train_thomas_and_friends.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2800/4507/files/joe_and_charlie_aa_youtube.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9407/2214/files/48077626079.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4033/6793/files/persona_5_hermit_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4218/4095/files/wafulufikozutituvekijizop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2335/4021/files/singapore_math_workbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f88876b3-1147-490a-8ec3-507fe813ea56/81787717296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d1dcad5-6fa9-474b-bd9b-c04556fafa74/78064488974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e276987f-9802-4495-bf54-a1a06c0152a1/43161985476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50065936-2749-4bfb-81a6-49acdd465982/paselukef.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_off0000644a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x644A 5664 bytes
SHA-256: 50c0a2bab6d2449061ef85e3931adc52af24524275e5121f0f3ef73a1c44d57f
font_01_sfnt_off0000776a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x776A 10132 bytes
SHA-256: 7d4ccb1d81526d54afa8c01d381d254eaf68041dc9599d09e9e599f99c894bd8

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