Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c4eb628f762283…

MALICIOUS

PDF

44.7 KB Created: 2020-10-18 18:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: bf1430798b195b9b7b45773e0a6055f4 SHA-1: 679bda79c49b2b7e080ae55097baf72b1a67e50d SHA-256: 53c4eb628f762283bf7e078629eccc6d9e8a239c742f16a2e6cf808299277088
184 Risk Score

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=interjection+worksheets+for+grade+5+with+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369162/normal_5f8c5618f3d1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369633/normal_5f8b13bbbf360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375095/normal_5f8a2ae392e2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375352/normal_5f8b17714ca25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5f8ad4265b839.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369514/normal_5f87b74923568.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372080/normal_5f8b344fc59ea.pdfIn PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/bilerolet-nufatu.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/bf4458.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/3355978.pdfIn PDF document text
    • https://gevafitasib.weebly.com/uploads/1/3/1/3/131380901/1429013.pdfIn PDF document text
    • https://gevafitasib.weebly.com/uploads/1/3/1/3/131380901/e27909d0be.pdfIn PDF document text
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/vizufapufikimi.pdfIn PDF document text
    • https://dojulukasinu.weebly.com/uploads/1/3/0/7/130776790/2592109.pdfIn PDF document text
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/purepage-batimaj-xogorebarizos.pdfIn PDF document text
    • https://nulakumoxuguv.weebly.com/uploads/1/3/1/8/131871970/baram.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/7f0d713f-ea35-45c7-907f-8ceef041a562/84303433898.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aae5781b-7c0b-45b4-928a-4c0598febae6/lowaxawasipizapime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47fbfb7c-bfc6-4ef2-8c51-bd87519e5928/2904763200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54ef4885-33aa-46da-ba58-f80adbea7678/55807847861.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8697/7441/files/mapa_turistico_lisboa_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4430/7098/files/10375816330.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8963/4491/files/bosodetunupevezukirupofe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/2795/3312/files/pediatric_normal_lab_values.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6239/4517/files/basic_training_for_the_prophetic_ministry_study_guide.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_off00006eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EEB 5544 bytes
SHA-256: 8c8f547fcbac8adf1d4379d312b8a954cacae96d5f8777f05ed2e244d39b6b1b
font_01_sfnt_off000081dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81DC 10244 bytes
SHA-256: 2e30bcd296de7358cf43a0f506ba0555460deaf6fb3df4e2a46270cab054f682