Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee22a1a1e03749ad…

MALICIOUS

PDF

51.5 KB Created: 2020-10-16 12:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 946d63cd9ba28a34a438e9276642e9d3 SHA-1: 71533c55e9915dfc94ebe9899cd084c7541af64c SHA-256: ee22a1a1e03749ad954492d626302f477202e5efc47f1ed787afde5a95c8cdc8
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 a link farm designed to redirect users to malicious infrastructure. The primary redirector URL identified is https://ggtraff.ru/123?keyword=android+spinner+adapter+kotlin. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to obfuscate or distribute malicious content through a network of linked documents.

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=android+spinner+adapter+kotlin In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369928/normal_5f88a3ef70e40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365657/normal_5f875bd5108f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370278/normal_5f888c88d25fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5f8703e0d38f7.pdfIn PDF document text
    • https://meporolokiso.weebly.com/uploads/1/3/2/6/132681401/8577470.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/rimotipa.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/fubisi.pdfIn PDF document text
    • https://laxuruvu.weebly.com/uploads/1/3/1/4/131482832/3425761.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/xovaragimogerem.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/000e5585-ba12-433f-9c94-ac98fb80b71c/donoxozedulirimemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/019fcf6c-b5fa-4e32-a216-9bdf2ac4497a/gusiluloxajaretupalaxox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2f0e0cf-f56d-4da8-bb2e-2a3e1a6cc34f/bepipuguzafadesoxofane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b4d8189-8442-4003-9834-6a731ff86eda/94459992717.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5518/0695/files/xaboletazogokibofuku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7035/7653/files/zajifepazawazi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4714/7925/files/lifting_gear_inspection.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/0114/7302/files/24602255877.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3144/4128/files/library_of_functions_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/7567/6581/files/greater_latrobe_school_district_administration.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/3355/9708/files/39890987202.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2762/3836/files/10691572336.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_off00007e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E24 5004 bytes
SHA-256: 1f22fb81ec01bef3deca6eeff34a11656631ef388374429e8842541f43a70156
font_01_sfnt_off00008f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F33 15820 bytes
SHA-256: c1ff3cb2482ca476b17fc9f4b84096774f4fc2223b2d0ce1c01d9fb21ce323aa

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