Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb5c8429998fe06…

MALICIOUS

PDF

52.0 KB Created: 2020-10-03 19:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 3961fcfc775e4d441f4a2a5ff483d785 SHA-1: b887986e8ee49acac12b5180bfe3744992168c3f SHA-256: 4bb5c8429998fe06fcbd6168d493093e3a360e9f01812c424fa4de82eef4eb20
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://ggtraff.ru/strik?keyword=adcirc+user+manual+pdf In PDF document text
    • http://files.burnsplanning.com.au/uploads/1/3/2/7/132741482/munixoma.pdfIn PDF document text
    • http://direbaka.ysk-chb.com/uploads/1/3/1/4/131406676/tamazemowesojimidal.pdfIn PDF document text
    • http://files.mfwchicago.com/uploads/1/3/0/7/130775959/gepogajewukanodovune.pdfIn PDF document text
    • http://files.ongedierteadios.nl/uploads/1/3/2/6/132682623/loxelowunebujajikan.pdfIn PDF document text
    • https://site-1037902.mozfiles.com/files/1037902/lufilupinoruseri.pdfIn PDF document text
    • https://site-1038608.mozfiles.com/files/1038608/kaseliremobupitozareruwot.pdfIn PDF document text
    • https://site-1042892.mozfiles.com/files/1042892/jovikewagosisexolide.pdfIn PDF document text
    • https://site-1037261.mozfiles.com/files/1037261/67942837544.pdfIn PDF document text
    • https://site-1037111.mozfiles.com/files/1037111/82542085057.pdfIn PDF document text
    • http://files.southforkprovisions.net/uploads/1/3/0/7/130740138/522677.pdfIn PDF document text
    • http://files.education-4-change.org/uploads/1/3/0/8/130874038/bamuxufexizud-rigonetutano-nemuroledisomin.pdfIn PDF document text
    • http://files.blessyourheartyoga.com/uploads/1/3/1/4/131452815/kizise.pdfIn PDF document text
    • http://vugusu.artsplacecheshirect.org/uploads/1/3/1/3/131382700/bufakuvarakod.pdfIn PDF document text
    • http://files.troutlilycoffee.com/uploads/1/3/0/7/130740622/fefogavizubu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5331/7272/files/chapter_7_geometry_test_answers_prentice_hall.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_off00006f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F01 8596 bytes
SHA-256: b2d5bf11f213bbdd7a5d4d995df528aba028139cb1b55a3887a41159792f888f
font_01_sfnt_off00008bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD6 5288 bytes
SHA-256: a79c16ab3fe0a10ac792f8d0a20bc071a09c041ef6eb2ef9de3d73d5f5470437
font_02_sfnt_off00009dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DBC 10864 bytes
SHA-256: d99b9c08355c9c5a0904196144b2a73af531c3e1980f2843f9d8714fa5602efe