Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8635de2bfd56959…

MALICIOUS

PDF

42.1 KB Created: 2020-10-04 11:40:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d2e136a952ecadb33ec779162061f555 SHA-1: 9be9ab668edc39807d3a8791ab4572281a002753 SHA-256: c8635de2bfd56959f3b93f0862b10326f1b5d8ba85a321bdf72d4bb51994d8e7
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=fce+practice+test+pdf+answer+key In PDF document text
    • http://lirak.kristyshute.com/uploads/1/3/1/0/131070325/9586505.pdfIn PDF document text
    • http://files.allinonerenovationsllc.com/uploads/1/3/0/9/130969562/fezuxi.pdfIn PDF document text
    • http://files.sparklycharkaleephronesis.com/uploads/1/3/1/0/131070195/xuziwagutemo.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/8a9529eb-e426-4e2d-81e2-42507ad262ba/27355901303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63e44dbe-b0bf-458c-b44b-43a23270463e/62088244501.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1248/8343/files/11736271108.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/7867/6380/files/guess_the_pic_word_game_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b452d66e-2f31-463f-bb3a-858767b9d6e8/5135709790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fd6fcdf-3697-4788-9f9a-eb35d9c6018c/dudaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5a5c0a2-f35b-4ed6-b658-cdb96bef56fc/5081038457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ef8594d-1afc-477c-b3ef-f588d9c3a96d/jegijor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac7b9447-a1e5-4b37-a372-ddc39e037313/nirotuguwixodilupoputu.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_off00006624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6624 5332 bytes
SHA-256: e1b256bbd541eb5985d2c0107a7e64bfaf0fa6c8926af37926e103912345fd07
font_01_sfnt_off00007873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7873 10388 bytes
SHA-256: f41075534f5dd6fe17501e99f671b4ff631b660d9a46f6becda6fdd75bcd2bfd

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