Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f8140e6d315a5f…

MALICIOUS

PDF

42.9 KB Created: 2020-10-04 01:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cb4f23eacd6d0447c3f5515e929ba770 SHA-1: f393d5e2e2b98863b179a8650535dc691d22f887 SHA-256: a5f8140e6d315a5f7387b1bc8fa18b72fbef14f9856bf4f8066a5b7a21f3ab87
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to disposable hosting and redirect to a malicious URL. The primary malicious URL identified is https://cctraff.ru/strik?keyword=vitamin+c+serum+formulation+pdf, which is flagged as a malicious redirector. The document body text, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users into clicking through to a malicious site.

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=vitamin+c+serum+formulation+pdf In PDF document text
    • https://site-1036628.mozfiles.com/files/1036628/93679833520.pdfIn PDF document text
    • https://site-1036772.mozfiles.com/files/1036772/42548307218.pdfIn PDF document text
    • https://site-1042992.mozfiles.com/files/1042992/vibetabusidoja.pdfIn PDF document text
    • https://site-1038427.mozfiles.com/files/1038427/wewokuledoz.pdfIn PDF document text
    • http://files.discoelectroson.com/uploads/1/3/0/7/130739415/tivag.pdfIn PDF document text
    • http://files.dallasteapartyco.com/uploads/1/3/0/7/130775371/kivikexijos.pdfIn PDF document text
    • http://files.febinteriors.com/uploads/1/3/1/3/131379381/e32656c2309ba46.pdfIn PDF document text
    • https://site-1039608.mozfiles.com/files/1039608/55154922894.pdfIn PDF document text
    • https://site-1036932.mozfiles.com/files/1036932/sifidefolotab.pdfIn PDF document text
    • https://site-1037260.mozfiles.com/files/1037260/24784748128.pdfIn PDF document text
    • https://site-1037059.mozfiles.com/files/1037059/namepegopusoxubazubuv.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/1/0486/4281/8206/files/batofaretijerikudowi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/5890/7304/files/asheville_fine_arts_theatre_schedule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4590/7349/files/17838062182.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_off000068dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68DD 5264 bytes
SHA-256: 7ee730a0aa9db2f246fa1e1e29da0135feeb3f5b4afbde94a9fa818e5871bf96
font_01_sfnt_off00007ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB3 10540 bytes
SHA-256: 6f79f2278f104bf9d4a38469780dcf4750cd657f3ca79dcfcd447f997f7ab179

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