Malicious PDF — malware analysis report

Static analysis result for SHA-256 2302b51f4560c716…

MALICIOUS

PDF

48.8 KB Created: 2020-10-07 05:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 67e7299a66d0ef855e44c220d02daa7d SHA-1: 34839975e2f1ac7fea9fc1243d82b17c883b0c3d SHA-256: 2302b51f4560c716ab06efbf5976aa7b5a1eafce9d1b0273cd76c5dbce5920a6
184 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to various PDF files, with one prominent link suggesting a download for 'amar chitra katha comics pdf'. The ML classifier strongly indicates maliciousness, and the presence of redirector links points towards a phishing or malware distribution scheme. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to lead users to further malicious content.

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://gettraff.ru/strik?keyword=download+amar+chitra+katha+comics+pdf In PDF document text
    • https://site-1036781.mozfiles.com/files/1036781/94474972117.pdfIn PDF document text
    • https://site-1043565.mozfiles.com/files/1043565/werazime.pdfIn PDF document text
    • https://site-1036803.mozfiles.com/files/1036803/4753854494.pdfIn PDF document text
    • https://site-1043967.mozfiles.com/files/1043967/risiwamawobisusa.pdfIn PDF document text
    • https://site-1041694.mozfiles.com/files/1041694/soxef.pdfIn PDF document text
    • https://site-1038455.mozfiles.com/files/1038455/28102054315.pdfIn PDF document text
    • https://site-1038693.mozfiles.com/files/1038693/99010726915.pdfIn PDF document text
    • https://site-1039194.mozfiles.com/files/1039194/vuporarepadijoti.pdfIn PDF document text
    • https://site-1039898.mozfiles.com/files/1039898/bamojunaxar.pdfIn PDF document text
    • http://files.drumcrimewatch.com/uploads/1/3/0/9/130969950/pudebaxijizol-kufizuxakut.pdfIn PDF document text
    • http://files.northernbugwear.ca/uploads/1/3/0/9/130969195/93543.pdfIn PDF document text
    • http://files.reikiwithjane.com/uploads/1/3/0/8/130814591/dafigezezomirak.pdfIn PDF document text
    • http://gotafan.puertoricandj.com/uploads/1/3/2/8/132814439/38e20004.pdfIn PDF document text
    • http://suturope.redyogaannarbor.com/uploads/1/3/0/9/130969723/6148cad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off00006547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6547 5220 bytes
SHA-256: a4469a0e6a8def19aee7ecf8833c406aa8fdb74b0906cb362b17a839582c210d
font_01_sfnt_off000076e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76E3 15408 bytes
SHA-256: a142ed6a219b6aeef132dd3094736bcca35907ea4f1ab0f03d9473ce554ce108
font_02_sfnt_off0000a587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA587 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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