Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e5f15d8392d86b…

MALICIOUS

PDF

50.7 KB Created: 2020-10-29 12:38:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 70e730e750d3b12bb0ffede28ff15d5e SHA-1: 1519cafaa42e8dc74a69c0d38fb32ae573eff871 SHA-256: 49e5f15d8392d86b25164bf31fdf9227820dc631e90094ac24c75f7e5b9fe6e1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary links directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards a malicious document designed to redirect users to harmful sites.

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/aws?keyword=minerals+regents+questions+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376358/normal_5f8e331c06684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371266/normal_5f972a1492fa3.pdfIn PDF document text
    • https://subulutug.weebly.com/uploads/1/3/4/3/134349811/2695975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412382/normal_5f95233726471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383797/normal_5f8ccaae47ea2.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/tipot.pdfIn PDF document text
    • https://kaxokotul.weebly.com/uploads/1/3/4/3/134380066/wekutit-degalupabora.pdfIn PDF document text
    • https://rajaxamakato.weebly.com/uploads/1/3/2/3/132302926/gunavalojo-sixegokoziwitu-paxuse-zogivase.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372673/normal_5f8979aa717c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c70c7b46-002b-4e4c-8f34-0b13ca3fee5d/data_science_for_dummies.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6295/1581/files/25795825837.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/4456/8989/files/cours_de_physique_chimie_seconde_gratuit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9689/4357/files/new_esc_guidelines_for_heart_failure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edd5e2e4-1548-42f9-8a05-d60a5b5e1ef5/exemple_valuation_un_chaud_formatio.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/8829/2261/files/sosazanukuruxugavis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/3075/9582/files/kiwogomagozinixoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f6c3a2-a505-4eb0-bbd9-253405eeb184/70265297787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31f3d054-0e2e-40eb-8a05-6f72dd122cf4/40695900507.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7934/3527/files/proyecto_de_tesis_arquitectura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a0d8f0a-3f08-41de-a6e9-1320d99d9830/rome_2_crash_on_startup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/4060/1754/files/enoxaparin_sodium_injection_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b125aee-5817-431c-86c6-273c7a20d7a2/numamagorewibefowukelefi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2689/8344/files/four_heroes_of_palmyna_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0549/0846/files/41950685987.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7926 4960 bytes
SHA-256: 3452e1d0e67bad9da874f1ed918f4e8c98cc1e6f4a66e9a6a5b126fe6caadbe1
font_01_sfnt_off00008a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A1B 10836 bytes
SHA-256: 9473efe6e1300e6ec4bed142e2c2933aeeb242e789273aaf746eb7898a8641b7
font_02_sfnt_off0000aed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED8 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2