Malicious PDF — malware analysis report

Static analysis result for SHA-256 84079ec16e74380c…

MALICIOUS

PDF

63.8 KB Created: 2020-10-04 09:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cf75a70251fb08e6033be28c7f023d2d SHA-1: ec78183930d9e00a63bc182c284ca14bbb48f31f SHA-256: 84079ec16e74380cd90062523852feb9710e4247ada6f033ef0e939b42477937
224 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to what appears to be a link farm designed to distribute software. One prominent link, 'https://cctraff.ru/strik?keyword=vega+muhasebe+program%25C4%25B1+full+indir', suggests a lure for downloading accounting software. The presence of multiple PDF links and the ML classifier's high confidence indicate a malicious intent to redirect users to potentially harmful content.

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://cctraff.ru/strik?keyword=vega+muhasebe+program%25C4%25B1+full+indir In PDF document text
    • https://site-1039783.mozfiles.com/files/1039783/30052067823.pdfIn PDF document text
    • https://site-1043286.mozfiles.com/files/1043286/99280319537.pdfIn PDF document text
    • https://site-1038440.mozfiles.com/files/1038440/babatun.pdfIn PDF document text
    • http://files.nunavikyouthhouseassociation.com/uploads/1/3/0/9/130969169/bewujawuxelisu.pdfIn PDF document text
    • http://wafow.cinspics.com/uploads/1/3/2/7/132740482/dugotid_lakiliridu_xixavoziziw_gorofoduxusok.pdfIn PDF document text
    • http://files.thesixthelementtherapeuticmassage.com/uploads/1/3/0/7/130738914/zuruletozevun_gunisela_nulabibo.pdfIn PDF document text
    • http://files.bhutandruktravel.com/uploads/1/3/0/9/130969562/dipapuxorudebigegiwa.pdfIn PDF document text
    • https://site-1037875.mozfiles.com/files/1037875/puben.pdfIn PDF document text
    • https://site-1036685.mozfiles.com/files/1036685/fitulaxakupisu.pdfIn PDF document text
    • https://site-1039210.mozfiles.com/files/1039210/17716837950.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
    • https://cdn.shopify.com/s/files/1/0436/0346/0259/files/little_mermaid_sisters_7_seas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4677/1607/files/madison_county_fair_2019_illinois.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8BE 5396 bytes
SHA-256: c6ee33a5109b8ac48784abe9c59d7db67377763e3c352789341653d36760687e
font_01_sfnt_off0000bae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE7 12584 bytes
SHA-256: 569b774e2397ad95871a3ac44894fba461f85dc56453ecf248ae7f7711799012
font_02_sfnt_off0000e1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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