Malicious PDF — malware analysis report

Static analysis result for SHA-256 2edfb4a010ef2c87…

MALICIOUS

PDF

38.5 KB Created: 2020-10-01 03:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 9762111ec4bbfdd220c69eec60c9bc04 SHA-1: 4f3fed3701d8492b56f0ee8b44b46d88baccf027 SHA-256: 2edfb4a010ef2c87dd444632333821b328514885d9fa8a44cef0d53ba4b58d21
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://cctraff.ru/strik?keyword=adding+and+subtracting+fractions+and+mixed+numbers+pdf In PDF document text
    • https://site-1037240.mozfiles.com/files/1037240/betizabex.pdfIn PDF document text
    • https://site-1038427.mozfiles.com/files/1038427/39166975295.pdfIn PDF document text
    • https://site-1037203.mozfiles.com/files/1037203/88145753820.pdfIn PDF document text
    • https://site-1037268.mozfiles.com/files/1037268/wubadadonulutagebip.pdfIn PDF document text
    • http://files.paulmmallory.com/uploads/1/3/0/9/130969522/bulafebovovi_dodizod.pdfIn PDF document text
    • http://files.gbea-online.org/uploads/1/3/0/8/130873995/fufirenuza.pdfIn PDF document text
    • http://files.davycrockettdistrict.com/uploads/1/3/1/3/131383646/83db55bae6.pdfIn PDF document text
    • http://wiwesox.stonesglass.com/uploads/1/3/2/8/132815180/dc7727e14e1b.pdfIn PDF document text
    • http://files.thecherigroves.com/uploads/1/3/1/3/131398156/0c09cff1c7.pdfIn PDF document text
    • http://diral.muckypupspreschool.com/uploads/1/3/1/3/131398430/movimoxopid-galufisidejenu-nenuvaxasedede.pdfIn PDF document text
    • http://sebixowaf.qualesnest.com/uploads/1/3/2/8/132814946/8437aeb116df7.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/3221ab5b-ba6d-42e2-82a5-7a5cfeb86b5d/98509192157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ced103a-3ef5-4974-bb88-2070ea82da11/bufujevisalovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be9109ee-1f65-4211-a9bb-cbcd30acf602/60449529764.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_off00005605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5605 5640 bytes
SHA-256: 0d725cbccba37a1eecaa70ebebe0a81168c0029f41f2d790d3c311b71bab55a3
font_01_sfnt_off00006923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6923 10480 bytes
SHA-256: 281c9b0949ead6a612d1a82d9e33bb756e272d7867814b2cb14baa5334eced35

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