Malicious PDF — malware analysis report

Static analysis result for SHA-256 25dc91504a74998d…

MALICIOUS

PDF

41.4 KB Created: 2020-10-16 16:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6c0a1673614e1364a4e4d7a8621acc81 SHA-1: 7f9654af4bd7fd9efa797549509149d3a8c79b64 SHA-256: 25dc91504a74998d66e108b6b4ab7523aca12e5aae89f672beeaa3182d4684f8
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://cctraff.ru/strik?keyword=printable+protractor+360', which is likely intended to lure the user to a malicious site. The presence of numerous external PDF links suggests a link farm or a method to obscure the final malicious destination.

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://cctraff.ru/strik?keyword=printable+protractor+360 In PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/romawezexirud-morupaw-revaxolarovumu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_5f8721998b0a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_5f87382f4473c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369153/normal_5f88cfd7d406c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368251/normal_5f87fff80e7d7.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/1/0432/0863/8632/files/87357831284.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1784/6427/files/norafimalezoxeril.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3227/5865/files/transition_words_for_argument_writing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0468/5218/files/84472820158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45c14f2b-51b8-4860-a74f-c56a2a0d4744/28978435859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/009217e2-7c95-4e8d-8606-bf51a59ac0ba/kuzuroneme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/789c2036-3a63-43dd-95ca-878ad8f9c92c/35526373213.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99e2c583-e775-4892-a931-866fbacf9f15/xofutedenaxotegopero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec31c535-c7ba-4e46-843b-0f8ef6ca3f50/bumananekexovevid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3a49bf3-140b-4a99-a2ef-2d2f76c3da4c/9505573744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baa12b2d-7ba5-41b2-8f85-08f96abc1ded/99056635731.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_off00006337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6337 5348 bytes
SHA-256: f16ee6052f817ae0e93b634ff269ed8df1ec6705e39779fc4c810685a000d2e7
font_01_sfnt_off00007561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7561 10484 bytes
SHA-256: 50b5cbd7dcac7366ae6ada85135ee8b577801fbeb96b6c4cdeb9227a88b3d9e4

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