Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f324fc2c799f28…

MALICIOUS

PDF

55.4 KB Created: 2020-10-16 22:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1a12499c323e1db4f268ba3b7e93ad19 SHA-1: 61e2a97adafa53330076891ca0b969ed39ff65b0 SHA-256: 66f324fc2c799f28713fe4394eedae01ff7d5d3cdd636d0578c1eab40dbee9cd
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though partially obfuscated, contains text related to 'servidor proxy squid pdf' and a URL that aligns with this theme. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic to distribute malicious content. 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=servidor+proxy+squid+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368979/normal_5f87dfa3ba215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372702/normal_5f88c711e2efe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f87151c6bb85.pdfIn PDF document text
    • https://kabudededawizo.weebly.com/uploads/1/3/1/3/131383409/dc102ab0b703.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/780967.pdfIn PDF document text
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/2e70f709551c255.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/ligewajinaxi.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/kekikefuwu.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/7b548608-73bd-4d8e-8f11-cd6e5c57032d/funibubekizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cb6d92a-add6-46bd-a19d-629b2084dd5a/kerexisewaxopar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b983a7f-ffe5-424f-9637-40ace5c5a6f6/bavuxerikomirubizusufef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c19b25f1-9c29-4a6f-86ca-f538ab1ad762/wamepotefamow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a6bf9b1-c256-4e32-9a0f-5b9e8ebe6219/dakirafuwufejunafipiwebi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8091/1515/files/sikeginijuxomat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/5633/3468/files/dxf_to_converter_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2583/7465/files/grangeville_id_border_days_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9232/1451/files/sigma_chi_flag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7102/0957/files/adventure_time_tattoo_flash.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7869/4565/files/kiluxuxifelexixew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9385/9231/files/65041607466.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4305/9862/files/drawing_anime_eyes_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3482/9222/files/alesis_dm7x_nitro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1681/2706/files/kudejamefibejemaleroreki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/6804/5495/files/shapes_of_molecules_worksheet_answers.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_off00009b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B71 5252 bytes
SHA-256: 3b1d051dd70061dd9aaedf4f61fa45541c2f520a4db1c277d50e6a8cd26481be
font_01_sfnt_off0000ad6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD6B 10216 bytes
SHA-256: 08c19807db870fca06f2cd755242ccf44e03842a15a6c777334822b20b28bf74

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