Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d88a11f2216957e…

MALICIOUS

PDF

43.6 KB Created: 2020-10-06 11:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 23b480431fd18708d12e54f2f55ffcd5 SHA-1: 0a60f439bd7cd2bfd4ed1399a27f67cdf6c4c876 SHA-256: 4d88a11f2216957e1fea129cba6b20d73e60aa2610af19ec88cbe76a89ca30c6
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=abbyy+finereader+for+fujitsu+scansnap In PDF document text
    • http://files.nasuwtrochdale.org/uploads/1/3/1/4/131437593/sovipaxokuk.pdfIn PDF document text
    • http://files.stephaniesaywell.com/uploads/1/3/2/8/132815180/5403456.pdfIn PDF document text
    • http://tebobik.larosegc.com/uploads/1/3/0/8/130813554/6735118.pdfIn PDF document text
    • https://site-1039509.mozfiles.com/files/1039509/rudurazosevevilezenela.pdfIn PDF document text
    • https://site-1048172.mozfiles.com/files/1048172/2734248370.pdfIn PDF document text
    • https://site-1037145.mozfiles.com/files/1037145/ninijemor.pdfIn PDF document text
    • https://site-1036838.mozfiles.com/files/1036838/jofuruselixubuzazida.pdfIn PDF document text
    • https://site-1038541.mozfiles.com/files/1038541/dedoluzofobatixade.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/64cfbc46-2d9f-401c-bb71-f3262a86cbae/walukirofujubonakidelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b55f2eb5-dd74-416f-9fce-50ddf9562529/98052876370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16502db6-a729-4b96-ba94-06ba5ab777a3/nawosesana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bf373e8-e3ca-4a10-bc90-d20bc998ad01/88023728723.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f95667f0-52f3-44e8-85ee-90a54c43d5f9/sakuwijatunajewonoxar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e3d426e-1279-4a98-a6a2-ab0705ac5b22/kuxon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ff52c45-41d2-401c-b194-78aa8dc23f60/depusudagazubugumevazav.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_off00006989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6989 5424 bytes
SHA-256: a8eafa4a08cc609a68a3143204988c609a90ce022a20be74bcd8e6b1ef4fd47d
font_01_sfnt_off00007c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C17 11120 bytes
SHA-256: d1bdc495666fe077b16579497a8c1ab3d469f3c7f412978d690ee08519c8d11f

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