Malicious PDF — malware analysis report

Static analysis result for SHA-256 7481f9e2c5683588…

MALICIOUS

PDF

42.7 KB Created: 2020-10-16 16:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b4010b2fecfc3a5e8333f6d89bd15832 SHA-1: b4d6eebae597a69c770ba83af4c68f7185513cfd SHA-256: 7481f9e2c568358862caac16672f56a035d18106d199f9fb7a46d46037d7e79a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to a redirector service, which is indicative of a link farm used for SEO manipulation or malicious redirection. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ttraff.club/pify?keyword=maxi+cosi+2+way+pearl+user+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5f874d4572ecd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369779/normal_5f87fca34270c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f8933f732151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f8780c5f18b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368481/normal_5f89654f9fa54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5f871dcf948b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367674/normal_5f8889db49611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f88753ea28ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_5f882ca53da09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370053/normal_5f887bea5581b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370053/normal_5f888b59806b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369166/normal_5f891543798ca.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/1/0497/1560/9761/files/50253736252.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7255/2601/files/fekekumitiwur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2945/5271/files/wechat_apk_free_download_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/615046b9-64cb-49fb-ae4b-81397a32cff1/motaxulaneraranojemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8a02540-7c02-464f-be50-def34a06d220/vikerigixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89461a73-7cef-4083-88eb-0ad16905765b/27547238565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/106513ee-6adb-404a-8bce-4e74b6975403/xawadiwizagup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b984fda6-1df5-4eed-b8d6-1ac46c580a7a/28250551277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/443aa76e-a9cb-47e6-ac1c-173040bc34fb/levif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/167b4560-81cc-42a1-96b2-7a4955ecf684/42941028035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fb8a402-395a-4a60-9bef-8a8be4cee47b/42636790263.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_off000067b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67B3 5476 bytes
SHA-256: 8ae7309069a0345202c75b6d5e89bc64fe6a40f5935458631b3e1348036b1959
font_01_sfnt_off00007a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5F 10128 bytes
SHA-256: a395a21a39324fbba2aae23dbf522a953bfa799822752e1798877c13a2081b9d

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