Malicious PDF — malware analysis report

Static analysis result for SHA-256 4884ab1363e67b1e…

MALICIOUS

PDF

42.1 KB Created: 2020-10-03 11:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2be8630a1a43e6bbd5a6a7dba52d2f6f SHA-1: e9325260448d5c9a3b57143d0f4bf046e6df2ffe SHA-256: 4884ab1363e67b1e0fa3b6ad0a90ac251bdd99da4deda94247b846ab278c94e8
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier as malicious and contains multiple links to known malicious redirector infrastructure, including 'https://cctraff.ru/strik?keyword=mp4+hollywood+movie+in+hindi+free+download'. The document body, though heavily obfuscated, also contains this URL and numerous other links to disposable hosting, indicating a link farm designed to distribute malicious content. The primary attack pattern observed is the use of a lure to entice users to click on a malicious URL, likely for initial access via spearphishing.

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=mp4+hollywood+movie+in+hindi+free+download In PDF document text
    • https://site-1037260.mozfiles.com/files/1037260/21699996553.pdfIn PDF document text
    • https://site-1040101.mozfiles.com/files/1040101/dalawevur.pdfIn PDF document text
    • https://site-1036764.mozfiles.com/files/1036764/vuponer.pdfIn PDF document text
    • https://site-1040888.mozfiles.com/files/1040888/7327247662.pdfIn PDF document text
    • https://site-1037900.mozfiles.com/files/1037900/wivuxovisurojawitetume.pdfIn PDF document text
    • https://site-1039911.mozfiles.com/files/1039911/89305649095.pdfIn PDF document text
    • https://site-1037059.mozfiles.com/files/1037059/wavakevavasala.pdfIn PDF document text
    • https://site-1039907.mozfiles.com/files/1039907/zuboragukufupuz.pdfIn PDF document text
    • http://menugugex.psweloveu.com/uploads/1/3/1/8/131856772/346a46f4ee8.pdfIn PDF document text
    • http://files.aliciacasiano.com/uploads/1/3/1/3/131384605/4150583.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/1/0485/9759/8368/files/sensen_suspension_review.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5060/5461/files/sobogimuxiwafixawazolowim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8291/6767/files/conduit_fill_table_fmc.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_off00006474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6474 5452 bytes
SHA-256: a2532d9533d2de96ac91614090914e2d612708c7a686b170fa8c7f4edf3fbbb5
font_01_sfnt_off000076ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76FF 10936 bytes
SHA-256: 4f79aa360785857f7795b995a274b1d2c356f4c62e8ff9d060ec77370e13f13b

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