Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d774532db5ffb5f…

MALICIOUS

PDF

43.3 KB Created: 2020-10-15 13:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 39ddc38e07ee42102bf98fccfb7c0eb6 SHA-1: 5b6ce669957c8b852c4307b92ffb3e353d23dd98 SHA-256: 5d774532db5ffb5f2fd3d35ea4cb94f4ff18382d527ced797e2950a4673fb87e
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for downloading an Android application. The ML classifier strongly suggests maliciousness. The primary IOC is the redirector URL used in the 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://gettraff.ru/123?keyword=instagram+download+android+4.0.4 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367916/normal_5f876a571c69c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367268/normal_5f8826ea21f22.pdfIn PDF document text
    • https://site-1042607.mozfiles.com/files/1042607/80143168695.pdfIn PDF document text
    • https://site-1043664.mozfiles.com/files/1043664/62882685272.pdfIn PDF document text
    • https://site-1039297.mozfiles.com/files/1039297/wutikogekokerinutu.pdfIn PDF document text
    • https://site-1042101.mozfiles.com/files/1042101/91439965658.pdfIn PDF document text
    • https://site-1042880.mozfiles.com/files/1042880/business_expense_worksheet_template_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5f8758c27b07c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366347/normal_5f8753fbf01d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367631/normal_5f87486973a2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_5f8742a7f0115.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366645/normal_5f8781ccb6387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5f8720c0f17f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5f87403195a05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f871dc2bf581.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/1/0498/7607/4654/files/algorithms_book_robert_sedgewick.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/augusto_boal_games.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8460/1752/files/coast_guard_orm_process_steps.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9342/5316/files/vubibelopovafolexobenuxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9462/5441/files/frp_bypass_android_6.0_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8609ea4-5bc0-4e3d-b941-db0a8177c1e5/85618663141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45d580ea-1951-44ea-85e0-0896c02c6bb8/97496728746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e4e0e8b-9464-4233-958f-fd8bd135a3bf/nitawaparevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77c31a9e-1782-4852-a230-b446b0a99c25/22378081644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89d1a5ca-d3a6-4913-aeb9-9ccfebae08bf/ninagigobutek.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_off00006b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B2F 5436 bytes
SHA-256: 7d85d87f12d8630db540a7821a3b0c412b60d28322ed521ee24d46c533e7a1e0
font_01_sfnt_off00007d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D9E 9936 bytes
SHA-256: 8dfb93fcd12b6b58b9b7c487b073d61b9578acdef575a0bcf464fe7ed582d3b5

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