Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8fa041a35acc9e…

MALICIOUS

PDF

60.3 KB Created: 2020-10-13 00:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 9124db88c56867e1af454087989e8e76 SHA-1: 7bb1b37b785a05a74cceed9ccd95be2621e1b6f0 SHA-256: 9d8fa041a35acc9edd70ae5cfc1edf8c98a8ab1bc8fd5fe0339bbb64b89c3cb9
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=proper+noun+examples+pdf In PDF document text
    • http://bezikodu.nxpkinkora.com/uploads/1/3/1/0/131071258/8659666.pdfIn PDF document text
    • http://fifumapi.graham-enniskillen.com/uploads/1/3/1/0/131070306/vufilutufisixixe.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/1/0484/2786/0122/files/2175118412.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9413/8268/files/3_variable_system_of_equations_word_problems_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9553/2722/files/leather_wallet_kit_michaels.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83ba13d5-c9c3-4d7b-8afc-7612207ef7d8/dudukumufelupazobiwilakin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d665e9d5-857e-4b14-99c0-1d77dace5eb1/10534327774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2c359f4-4b4b-4bb0-9966-8810dfab1232/bovonexuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72bad5c9-c9ce-4287-83fd-ab611d0834b0/64797854124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e51f9679-92c9-47d8-9667-09bee5d4462f/zexaxobe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0118/3397/files/84356298568.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5387/5357/files/chandamama_stories_in_english_audio.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8106/2805/files/gupeguvexoli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6182/0054/files/precalculus_chapter_1_review_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8699/3813/files/july_august_september_october_november_december_2020_calendar.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_off0000afaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAF 5256 bytes
SHA-256: 9f9895c2d46ec58e01108dd5d2546cc089693ffb02b3f642f4432a15b606eb75
font_01_sfnt_off0000c176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC176 10220 bytes
SHA-256: 6d6c16331d67e6ae20787d57b7ec23943ad5ad928f2b75902b706d4c7351dc52

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