Malicious PDF — malware analysis report

Static analysis result for SHA-256 214c99bb3afadd53…

MALICIOUS

PDF

57.7 KB Created: 2020-10-15 07:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: eed68cca2efaba40266ac095f31e0df1 SHA-1: 28a36195c1457a123013cb316a10b260995462a4 SHA-256: 214c99bb3afadd53ae1b99b882f11dff67a3ceecf6043ae50f2021f34e77151d
174 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://gettraff.ru/123?keyword=patricia+briggs+burn+bright+pdf'. It also exhibits a high number of embedded PDF links, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious, indicating potential exploit 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/123?keyword=patricia+briggs+burn+bright+pdf In PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/bd55ea4.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/zakeme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5f870bdc684b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366647/normal_5f877679e37bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_5f870a416db34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f870d0343bcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367278/normal_5f87ad8b9b568.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366385/normal_5f87bdc317a56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5f8713be96429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366969/normal_5f877c95492cf.pdfIn PDF document text
    • https://rezizeme.weebly.com/uploads/1/3/0/7/130775554/sodim-dajozigesozix-sojesumupusimow.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/bawap.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/56323bfb-9f7f-48da-9c61-a60a46490a95/66236367807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/704bb81d-53c0-480d-b6cb-7bf1ab731ee6/32336973829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71145cf8-e1f4-417b-8d28-8acc8bf3ef91/4457019313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ded1f6a7-96f8-4ffa-863a-2ad3c07be4f4/rogelosali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e187d27-cc66-4bed-88d9-48be8dd9155f/97777281007.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9424/0151/files/pathfinder_animal_companion_sheet_fillable.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0468/8750/1981/files/22769573791.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BAB 5528 bytes
SHA-256: 834a5149ec1afdcee4bf3de0e77012046c23626941f25ff58325607a6079bc88
font_01_sfnt_off00009e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E60 10436 bytes
SHA-256: 60301a65c605dd79a5c59a0df2c656852016766760db900138bbd8dfad9f352f
font_02_sfnt_off0000c25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25C 16448 bytes
SHA-256: 4d0b7fceb6e0b8544dba10d314310d86ee7e0ac375a8e3b5fd915ca5fa71995c

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