Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4dfb6dd7c17fefc…

MALICIOUS

PDF

58.8 KB Created: 2020-10-13 14:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6f899061cc25113422fc778dd4db7909 SHA-1: eca21e0d80db29c004f20935a7b0dabcf9a93fe8 SHA-256: d4dfb6dd7c17fefcfedb281da180bcd07c7135fbb9ac802ce2dad04dd92f1618
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, many of which are hosted on disposable domains or link farms, indicating a likely attempt to manipulate search engine results or distribute malicious content. One prominent URL, https://cctraff.ru/strik?keyword=christmas+songs+lyrics+english+pdf, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=christmas+songs+lyrics+english+pdf In PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/laresisif_kigadebokenub_bajutinerid.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/mezevoxinokimuwamibu.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/8279107.pdfIn PDF document text
    • https://site-1040663.mozfiles.com/files/1040663/71996199824.pdfIn PDF document text
    • https://site-1040135.mozfiles.com/files/1040135/67570443353.pdfIn PDF document text
    • https://jemiwuwavaza.weebly.com/uploads/1/3/0/8/130814288/bibesekukemugedovofa.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/f9007.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/monirafulowafix.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/0cbd7f35736ab.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/1515306.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/1/0496/1173/5193/files/shape_tracing_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9477/7757/files/los_cazadores_de_ro_piedras_hablan_con_el_alcalde_con_tranquilidad._1_of_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8451/3444/files/zuxijalak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0963/8553/files/powune.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5306/7682/files/norwell_middle_school_calendar.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_off0000a81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA81A 5576 bytes
SHA-256: c8fa96e1d690b278b8fab57710811087e1956ad1c9e8d6e2c1b05602d1e47295
font_01_sfnt_off0000bae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE7 10392 bytes
SHA-256: 5088a44a61c7129e68e0372938cbfbfe503d278e948ce9e2a006e4ecef2d13a1

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