Malicious PDF — malware analysis report

Static analysis result for SHA-256 73acfb5841021683…

MALICIOUS

PDF

49.7 KB Created: 2020-10-16 09:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: da971157740258b472d537df628ee5e0 SHA-1: dfc2bfd58546285a0de058a2986dd4e316fd0782 SHA-256: 73acfb58410216838ef615bf4137a375d8bfa8744fe4b341c780bfd29570c303
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with a significant portion pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector, suggesting an attempt to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=puzzle+games+apk+list In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369657/normal_5f887f9a2b4ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373520/normal_5f88bc9ea0e62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_5f88d0bbeaf41.pdfIn PDF document text
    • https://bijifejutumaxob.weebly.com/uploads/1/3/1/3/131381781/mufaletodopo-kamuzaximawep-xefuni-borirade.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/beparinunij.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/8291182.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/lanadez.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/3951db7e-bba1-467b-ab4f-ce294083beee/72530276099.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/650ea734-d0db-4090-90e8-2d378bb2cd99/41523031270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba51e8a9-ac30-4a7b-aba8-1c1be9762051/44881886032.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2c8b383-e70c-4942-9b9d-88475778d14a/41504368080.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3093/6733/files/download_novel_gratis_remaja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8951/6958/files/zekat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2638/1975/files/83503612013.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8846/1478/files/titavokubitanezifefosowu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6383/6323/files/synonym_for_longer.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7590/6973/files/conic_section_worksheet_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0835/2679/files/85949896169.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/2054/4931/files/tokyo_ghoul_intro_piano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/4456/8989/files/49354174614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/630c2830-5a82-4e18-8179-4ae249de2e0f/rabafojumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e79e227-de2b-4e2d-a060-a55482c7b7af/jalikovugazaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85a4325a-3c8c-45c1-b7c3-848b238c471d/99101857191.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_off00008502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8502 5160 bytes
SHA-256: 425a6b58004c6ef5d2ce7b7d60cfe4bc1272471cce13678f74742ee170b30f85
font_01_sfnt_off00009695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9695 10148 bytes
SHA-256: 14b763aa99232a20a494a0de492e88f6813c6fee39ff4aa6d7a6e800bdd0c66e

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