Malicious PDF — malware analysis report

Static analysis result for SHA-256 d807c627ea173d48…

MALICIOUS

PDF

42.3 KB Created: 2020-10-08 18:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a0f36e36ae3df1c51b1fad6ef2e6363f SHA-1: a6c26e011c8aa8b5ac5ea322433e279849766cf4 SHA-256: d807c627ea173d48ecc8d495b0ca5906c309a203f1fe743b1ff981e4f5402a0e
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, indicating a link farm or SEO manipulation scheme. One of the primary links directs to a known malicious redirector, suggesting a malicious intent to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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=sudokus+para+ni%25C3%25B1os In PDF document text
    • http://dusojo.elementfloorco.com/uploads/1/3/1/1/131164250/95961ab2e51f8e.pdfIn PDF document text
    • http://files.rfmconstructionkilkenny.com/uploads/1/3/0/7/130776327/56dfd.pdfIn PDF document text
    • http://files.estherarenasarroyo.com/uploads/1/3/1/1/131164202/9682221.pdfIn PDF document text
    • http://ruxote.projectredspark.com/uploads/1/3/2/6/132695643/rasoga.pdfIn PDF document text
    • http://gesibi.lagunabeachgop.net/uploads/1/3/1/6/131606490/8f4a3822148c6d6.pdfIn PDF document text
    • http://files.usfencinglongisland.com/uploads/1/3/0/9/130969079/f201579.pdfIn PDF document text
    • http://files.fantasycasino.net/uploads/1/3/2/7/132740987/fajavedojibizom.pdfIn PDF document text
    • https://site-1040223.mozfiles.com/files/1040223/79604556074.pdfIn PDF document text
    • https://site-1037010.mozfiles.com/files/1037010/zunamudotozujo.pdfIn PDF document text
    • https://site-1036651.mozfiles.com/files/1036651/meladuduwezajolizabaz.pdfIn PDF document text
    • https://site-1043810.mozfiles.com/files/1043810/26887469351.pdfIn PDF document text
    • https://site-1038831.mozfiles.com/files/1038831/jegixuxomuxozimebosuz.pdfIn PDF document text
    • https://site-1038482.mozfiles.com/files/1038482/dalotojakezalawawekip.pdfIn PDF document text
    • https://site-1036900.mozfiles.com/files/1036900/43379728093.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000064aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64AA 5300 bytes
SHA-256: 6016d68b5313a2e05da3473a786ae38afb32c26e2f4d8cfc8f315ce9262d4502
font_01_sfnt_off00007679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7679 11124 bytes
SHA-256: 15872fa374bb6fbdab5a8e407e7758c38aca6dae03cd7b323c195e3c644030da

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