Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d75de9884e218cb…

MALICIOUS

PDF

40.6 KB Created: 2020-10-06 10:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 8b06519bdef9146b6785699bd6593325 SHA-1: ed3a57650f08f1aae3b36d8ab3300ddfac27b4df SHA-256: 8d75de9884e218cb0ac225006d09f8789747e3c3b3c6f8cf648bb758a801e098
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=facebook+app+download+android+apk In PDF document text
    • http://vomofubir.mulvaneystudios.com/uploads/1/3/0/8/130813632/gusuzalebiwi.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/b353b1da-7733-45a3-bfc9-ad4ca3187889/62048680924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/618595ef-4244-4cee-9143-7715f3a9ac26/mivodifer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/668f3b18-5841-451c-af90-5c330ee03962/zajega.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6378/8188/files/economic_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7847/8743/files/how_to_view_someones_snapchat_story_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/3342/3783/files/wozelutapafurarotepug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2426/8968/files/watoguwuba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d892afe9-506c-428b-96aa-7446e7b05842/98721315599.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2703fc03-f09d-440f-9877-4c605242cb79/xunatiwolugudogolulezi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8633c616-8010-4651-bb29-800b7543cf3d/valazilafiputorifuxor.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_off00006034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6034 5140 bytes
SHA-256: d5a10e7464194b9c64e9c574d7bce7a3391488b710e86c49dfd7aeb1393dab40
font_01_sfnt_off000071ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71CE 10564 bytes
SHA-256: 72d2297dd9d667b1a2c44a1fbec9c6fd19572fbd916ffc24d1c068ef5003447c

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