Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf99c369e5e7d5d…

MALICIOUS

PDF

44.8 KB Created: 2020-10-08 20:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 399392c07d37199c7020d7709dec246d SHA-1: 5ac6593bb97b463bf9409d16a036a7d2d7d37ec5 SHA-256: 3bf99c369e5e7d5d0982c1b63101c1c13cf8336e7e3f47cf226aed194df56795
132 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?keyword=yep+120a+programming In PDF document text
    • http://files.momento.ie/uploads/1/3/0/7/130739060/lutalikaxa_fukimiziru_siwupipibose_vewatenux.pdfIn PDF document text
    • http://jubejilat.elizastollett.com/uploads/1/3/1/6/131606875/xaxuvizubobez.pdfIn PDF document text
    • http://files.stitchesbylynsey.com/uploads/1/3/1/3/131383763/sanelaw.pdfIn PDF document text
    • http://files.misiupapier.com.au/uploads/1/3/0/7/130775986/semevamupumubud-sotupesiz.pdfIn PDF document text
    • http://wixugo.nicsantrading.com/uploads/1/3/0/8/130874524/c65ba6b73f.pdfIn PDF document text
    • https://site-1036996.mozfiles.com/files/1036996/bedomirafotenovejematupo.pdfIn PDF document text
    • https://site-1039676.mozfiles.com/files/1039676/bukezi.pdfIn PDF document text
    • https://site-1036862.mozfiles.com/files/1036862/21100526117.pdfIn PDF document text
    • https://site-1039515.mozfiles.com/files/1039515/xudunedufexu.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/dc76cb23-80cb-4dd7-8b7f-18251aa82c14/70709168369.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd013b7-3623-4351-b776-f889616597de/20486369934.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2742/9536/files/kasagi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7035/6637/files/factors_that_affect_enzyme_activity_lab_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9159/8754/files/44066390192.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_off000067d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67D1 5216 bytes
SHA-256: ebe8e013c30ba4125f50ad708e4683d58cf850278f055163517ffe23f8ac771e
font_01_sfnt_off0000798b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x798B 14636 bytes
SHA-256: 9742c8fcf1cd9a43b6569046157e1d2912fbd36bab2ca79eb1bbbd6d1759eb72