Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da16938280bc346…

MALICIOUS

PDF

62.1 KB Created: 2020-10-11 02:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 45b7281e4a279d20990fdd793b534c49 SHA-1: 5717245b0315f324931479108b8e4207ecea31ca SHA-256: 8da16938280bc346ac5847a67f18e513ca2b13df0bfd2ad61907dcb3f5ffd319
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links pointing to external PDF files, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the document's structure and embedded URLs suggest it is designed to lead users to potentially harmful content or facilitate further malicious activity.

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=real+life+bionicle In PDF document text
    • http://sosagi.rachelmccarthy.com/uploads/1/3/1/4/131408061/vigolajefalobefubu.pdfIn PDF document text
    • http://lupurudid.weformplastics.com/uploads/1/3/1/3/131398351/8403606.pdfIn PDF document text
    • http://files.mskstech.com/uploads/1/3/2/7/132740842/kejesamaluji.pdfIn PDF document text
    • http://files.greaterwashingtonacademy.com/uploads/1/3/1/0/131070491/jixig.pdfIn PDF document text
    • http://files.gravelroadhome.com/uploads/1/3/1/0/131070246/worep.pdfIn PDF document text
    • https://site-1040438.mozfiles.com/files/1040438/romajutesivivaxizu.pdfIn PDF document text
    • https://site-1036761.mozfiles.com/files/1036761/12474459282.pdfIn PDF document text
    • https://site-1037054.mozfiles.com/files/1037054/28380793943.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/1/0431/1652/7770/files/5_lenguajes_del_amor_descargar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2048/3232/files/gadajok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4756/2645/files/zewasokizepozoxeduta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d00ce9dc-edba-445b-8350-65ad4f7e7f12/4217193785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba93a974-1d70-46a1-bb66-f27db9ee3f53/rusopukokuxutigafikifoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbcf7e6a-50a4-40fe-a69f-514b36552a27/refowelezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f6c518e-5763-4820-8f35-e236754473e9/leleroxitil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cb5ac31-8f04-4973-8902-8cc9227a8d4a/pepanisisovegotav.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_off0000b774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB774 4748 bytes
SHA-256: c588611ac3c1127efbc4037aca3f4823330a971b757afb2dcd92ca0d79b82675
font_01_sfnt_off0000c7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B8 10584 bytes
SHA-256: 9cc0567fea1613c2302baa04a08ffd09e5ca098a3a7ec843b861296c9a62e730

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