Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e930cf23cca221f…

MALICIOUS

PDF

45.3 KB Created: 2020-10-16 02:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 55976e6242c56d2db07969f3e1454859 SHA-1: 7f687d2a93d9131c754c7ce9291d87961649381b SHA-256: 5e930cf23cca221f81c1a181ee8fdf60eeaa4064875b00f4417f0a1465eee8b5
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for academic content. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous links, suggesting a link farm designed to distribute malicious content. No scripts were extracted from this sample, but the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent.

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/pify?keyword=net+ionic+equations+practice+worksheet+answers In PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/f22694.pdfIn PDF document text
    • https://xanodupujariris.weebly.com/uploads/1/3/0/9/130969381/6479652.pdfIn PDF document text
    • https://tabuxeniki.weebly.com/uploads/1/3/2/6/132682737/getobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5f8720099e64d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367283/normal_5f875d562a442.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_5f88c69057721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_5f873fa4d3714.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/1/0435/2802/8312/files/fijoworamusotebizo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7787/0786/files/round_hill_elementary_school_roanoke_virginia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7968/7587/files/xisezufiwarixupuwifofime.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1760/7589/files/wisconsin_deferred_compensation_beneficiary_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/0733/2511/files/red_red_wine_bob_marley_wiki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4387/9594/files/friend_locator_app_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/3200/8598/files/56627326077.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3771/2806/files/arduino_basic_programming_language.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7400/8741/files/5696517218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64f6693e-8459-4d61-9dce-c46a10ffb854/66492511703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a305cf2-7d00-4f02-b68b-62c550b500fc/disekimijuzelibiwomufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db740141-71b3-4890-bfd1-1722568cc5b4/juvetidimanodukasejuka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0aedbd9-9e95-4f7a-ab8b-38a559fde0db/gozapad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/377654bd-5071-4b0a-b9e1-5d2264250582/4303305185.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8341d5b-4daa-43bf-b328-69df44846f34/bivuloriza.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_off0000723c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x723C 5240 bytes
SHA-256: c2b42b2c62e00e6037d8a2b7180c9f93fba54cbde4c1b68c24bb61db0257170f
font_01_sfnt_off0000842b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x842B 10252 bytes
SHA-256: 9fcf7d7001821d00bcbc50fd8b6e11afdcdf98bf3fea9634d81f3881ac199bad

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