Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b7227889e3dbdd…

MALICIOUS

PDF

46.2 KB Created: 2020-10-15 12:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1b21cfabf920facc6cc137f603a7942e SHA-1: e7487cc8dc94aca19a64a2869fd3118467a7b808 SHA-256: 83b7227889e3dbdd6805785127fbe396201bb87409196eba2befc1c2b32d7c8d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of many external links suggests a link farm or redirection attempt to a malicious site.

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://ggtraff.ru/123?keyword=nrc+2nd+list+pdf+file In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_5f87472f108d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367631/normal_5f87ae108a61f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367013/normal_5f875eb343bd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5f8747c84e5ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f878d60d1d1c.pdfIn PDF document text
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/454202.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/7600545.pdfIn PDF document text
    • https://jemiwuwavaza.weebly.com/uploads/1/3/0/8/130814288/tigosorivibisakoxu.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/kovesulowapo-tapufovus.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/6bad3c2a-23fc-41d5-85e1-55b0f4945d87/murejunosevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89f520c3-fe5f-4a34-8fe5-a74733441a01/72821423029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41d41830-3df7-4954-8150-2328e80489ef/80962625928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c9960a9-3b35-4614-9417-7e6a800caff2/91996915511.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11e55f6f-6a6c-4480-8a88-2a10e76092a7/67838514018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5374/3270/files/dilomejapiwusesebeviz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2812/0217/files/compressible_fluid_flow_oosthuizen_solution_manual_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/4523/8949/files/lemunabe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0252/6872/files/mivikobabi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0101/9548/files/xesiroxatajokonejemepenuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1461/8277/files/how_to_write_a_casual_analysis_essay.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8886/2614/files/ninja_cat_9000.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3954/5761/files/the_two_week_diet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/5882/6916/files/coleman_weathermaster_ii_screened_10_person.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8177/2445/files/malobatenomotojurifozel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0527/9911/files/90061451246.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_off0000766d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x766D 5040 bytes
SHA-256: 8794f808de92d0befb4ccbf92037e74e532c8842155cdcc115add65eec3fb353
font_01_sfnt_off000087a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87A9 10408 bytes
SHA-256: 9a5fa6092ca7b180110cdbf49fe789f88425392d60b62d551132aa51c9dc1df6

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