Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0398f10c3f83a8…

MALICIOUS

PDF

50.7 KB Created: 2020-11-02 05:55:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 3b2ec166767ea63a88151391df78656f SHA-1: 0c48ac02b58b45f7333874dd0c56253456d5a789 SHA-256: 4b0398f10c3f83a8f230b8c96d8b25db816681e7a45cfabc26329f467628e30f
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://cctraff.ru/aws?keyword=the+walking+dead+vol+30 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383308/normal_5f9de365b3ff8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385197/normal_5f9200af95191.pdfIn PDF document text
    • https://wesodopudo.weebly.com/uploads/1/3/4/2/134234684/078d90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_5f8ef2d05374c.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/1/0504/5020/2814/files/happy_campers_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4573/4568/files/94330936037.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b7b607d-9f44-40ef-ab7b-23b8f43aea35/adobe_reader_japanese_font_pack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/746fcfed-76cd-465e-89e5-bd6a84e8b803/96418880624.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8905/0813/files/43039603782.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3984/2719/files/aime_cutoff_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdf7a561-0dbe-4c94-81bb-3f660566cb55/heroes_and_generals_squad_points.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24453295-a08e-41dd-ad5d-b39dc6e89dcf/76668173594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1ae0ee4-4ede-4d2b-b021-5f64c4d5d2ec/tekur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5daca56b-7be0-402e-a1d3-7f67a2c2220b/bemagogitusivosip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7013/4683/files/rikejiwix.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_off000085ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85CE 5284 bytes
SHA-256: 03257a7450cbced81f213abbb84a92bccd8b742bfc52fb88803fdf8376443402
font_01_sfnt_off000097e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97E6 11204 bytes
SHA-256: a68a004d64e70ac42b35e465783a2cf480c2f87605d2ddace77e53e81282f1ed

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