Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd3c63a0e52ae0f…

MALICIOUS

PDF

43.2 KB Created: 2020-10-14 18:40:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3b8c31e95bbae32c457a30d74a8eb319 SHA-1: 5648c0bd7b97f1653340a0f26f2c55c4df5ce875 SHA-256: bdd3c63a0e52ae0f99c146dac32b328823f7ae5c55129b16054dccc10749d12b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, also contains URLs pointing to external PDF files, suggesting a link farm or redirection scheme. This behavior is consistent with attempts to drive traffic to malicious sites, potentially for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=multiplying+dividing+decimals+worksheets In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365613/normal_5f871b8be34fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f86fb2152885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f8705e7027f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5f871147ae901.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5f870b1f5be8d.pdfIn PDF document text
    • https://site-1040280.mozfiles.com/files/1040280/dimarekefimipi.pdfIn PDF document text
    • https://site-1040681.mozfiles.com/files/1040681/nova_launcher_prime_5_5_4_apk_mod.pdfIn PDF document text
    • https://site-1036885.mozfiles.com/files/1036885/73908023602.pdfIn PDF document text
    • https://site-1040504.mozfiles.com/files/1040504/64631905869.pdfIn PDF document text
    • https://site-1037878.mozfiles.com/files/1037878/67098379208.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/menedo-fodizelusekom.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/sefaritonos-nukivafeka-retisebop-regaxumex.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/b628c54eef4e3.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/beparinunij.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/bf4458.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/5870292.pdfIn PDF document text
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/866f9c6956dfb96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365540/normal_5f8704922d41d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366348/normal_5f870e706edae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5f871a1436c70.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/2c9aa347-10d6-4d74-b986-362d4d1c3e1e/89727746841.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b45d3dc4-7f24-4607-8473-c5ce779ef408/80185165383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d47724bc-a00e-4707-9815-ab4bcabbe96b/fasipafogabibopenanovaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/475686b2-2519-4772-a9c4-7f4f39d67876/fexiwugajixexiwowaku.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_off00006899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6899 5812 bytes
SHA-256: 38a3827e0dcd26e39314c683ce9c10eb9edd304d0abbc4be428ce054dabc48a0
font_01_sfnt_off00007c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C52 10228 bytes
SHA-256: 8c9a9bcea141ccbb8782929cbeb2a5b3bd51477863b7a3365d359b96e4184842