Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf00cebc4674941…

MALICIOUS

PDF

38.7 KB Created: 2020-09-30 12:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 5dd0c10c0c58d3acc590cfa19ee606cf SHA-1: 6c12ab96f8a3b64f85dd2cb9fbb551e61ab97631 SHA-256: cbf00cebc46749414e33200229921c394135c78c233a814b8942fb2a5f2cbc69
224 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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.
  • 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/strik?keyword=benim+hocam+tarih+2020+video+ders+notlar%25C4%25B1+pdf In PDF document text
    • http://lenig.centralflhomeeducationservices.com/uploads/1/3/1/4/131408618/zanezaf-morapaweg-tewewalesijaji.pdfIn PDF document text
    • http://files.imaginediscoverexplore.com/uploads/1/3/1/3/131380609/d20b00d17ef5fb3.pdfIn PDF document text
    • http://files.edgewaterfitnesscenter.com/uploads/1/3/1/8/131871414/7514810.pdfIn PDF document text
    • http://fujokuwe.alicehorn.com/uploads/1/3/1/8/131871518/9604705.pdfIn PDF document text
    • http://files.knotanddagger.com/uploads/1/3/2/6/132695302/2490841.pdfIn PDF document text
    • https://site-1036820.mozfiles.com/files/1036820/gifixa.pdfIn PDF document text
    • https://site-1036851.mozfiles.com/files/1036851/70764862481.pdfIn PDF document text
    • https://site-1036805.mozfiles.com/files/1036805/fifepimokirofari.pdfIn PDF document text
    • https://site-1037054.mozfiles.com/files/1037054/famab.pdfIn PDF document text
    • https://site-1036759.mozfiles.com/files/1036759/fosalamanilinitiwozogekus.pdfIn PDF document text
    • https://site-1036848.mozfiles.com/files/1036848/22480662784.pdfIn PDF document text
    • https://site-1038395.mozfiles.com/files/1038395/vekiderogogolodesib.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/e32e4faf-2919-4f53-b6db-e659fbd1879f/90532000110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34e516c3-e84b-4f09-8b39-f1f1bb43651a/fudovekuzajopononikuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/901a8ce0-6ef4-4195-87ca-ae67eec37310/raluxov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e39bde43-89ce-46a5-b042-a30d921063eb/90558488687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5e822a8-9b8e-445f-b9b8-cc7254601f63/34171524604.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_off0000530d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x530D 5812 bytes
SHA-256: de3a05016ab4de630a11eff2f4aa424cf60c58e548d1840f89966c5af1b3427e
font_01_sfnt_off000066b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66B4 11540 bytes
SHA-256: d91a937f11e689d438f902062521665e805bc09232fdb497c104a9b0ee318760

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