Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a6470d7847d8ff4…

MALICIOUS

PDF

35.5 KB Created: 2020-11-04 10:16:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: bf745b8025866ded9932e82a72cff976 SHA-1: 5a7411cfef85c8db64c877b65c8b6ee2c6b58a0c SHA-256: 2a6470d7847d8ff4e5f58e68b9ec25029a7db5c102a46f9f7db46614dc1910bf
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests the document is part of a link farm hosted on disposable domains, aiming to lure users through search engines. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this PDF. The document body itself contains garbled text but also includes the primary malicious URL, confirming its role in directing users to harmful content.

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 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/aws?keyword=letter+sound+free+worksheets In PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/wamixa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379377/normal_5f9794cd3db34.pdfIn PDF document text
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/23fb4ff48829.pdfIn PDF document text
    • https://norudajesopoz.weebly.com/uploads/1/3/4/3/134340776/kibawitaguzudo.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/3765439.pdfIn PDF document text
    • https://kepoxenuranejes.weebly.com/uploads/1/3/4/3/134396716/138013.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/4140341.pdfIn PDF document text
    • https://rozazokosu.weebly.com/uploads/1/3/0/8/130813972/8866459.pdfIn PDF document text
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/292638.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/874972ff-b774-46ee-936a-1daafaeed5b6/mizixebezonuzadopeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d903a8ac-7456-47ef-b1f0-8fccaa02ea66/18256461221.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84c1358f-7ad3-4fce-bdb9-422bda8e7ce3/give_me_liberty_3rd_edition_chapter_outlines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28103288-040b-414e-adb4-9df3648581c9/92952347438.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99e76259-b091-4114-bcc7-ba394c53bb27/rorabusalesuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2048f65-ccf5-4dba-ae4d-351dd5ba094e/53166683002.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_off00004cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CD8 4848 bytes
SHA-256: 486ff8a04a3ef21086761914f9136852e889b0e4227e416bfa4d4cff6fcc0a68
font_01_sfnt_off00005d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D66 10560 bytes
SHA-256: 8205219928d1ac1e579dc00c5a608da9ef761bc3c1b46a7770004e4cd38a2898

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