Malicious PDF — malware analysis report

Static analysis result for SHA-256 e829552f4e6c4836…

MALICIOUS

PDF

37.7 KB Created: 2020-10-28 00:59:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 99da82a61edf0d79c9532096f9f22a22 SHA-1: 42282c6c248faa5da426c60a17f013179da17427 SHA-256: e829552f4e6c483617f0a622173ccdba23a7efb615ff44179b16d85b0eba0e66
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, many of which point to disposable hosting services and redirectors, indicating a link farm designed for SEO manipulation or to distribute malicious content. One prominent URL, 'https://ggtraff.ru/123?keyword=ryobi+tool+days+home+depot', is identified as a malicious redirector. 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://ggtraff.ru/123?keyword=ryobi+tool+days+home+depot In PDF document text
    • https://joleziravakejar.weebly.com/uploads/1/3/4/4/134460301/14b63d8e.pdfIn PDF document text
    • https://suzokixuvajix.weebly.com/uploads/1/3/0/7/130776208/tefexejukumefesu.pdfIn PDF document text
    • https://fenawivo.weebly.com/uploads/1/3/4/0/134000055/3497681.pdfIn PDF document text
    • https://ziperivowupidu.weebly.com/uploads/1/3/1/3/131381589/kopibu.pdfIn PDF document text
    • https://kuguzozivef.weebly.com/uploads/1/3/0/7/130739994/tefiwul-satozed-bujejukem-xilaxurizefivu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414847/normal_5f98a1d80d466.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5f87092dd09ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_5f9621cc1f35d.pdfIn PDF document text
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/3646353.pdfIn PDF document text
    • https://sovopubi.weebly.com/uploads/1/3/0/7/130775052/55e32409.pdfIn PDF document text
    • https://fosizujofaz.weebly.com/uploads/1/3/4/3/134315976/bulikelobutud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365562/normal_5f873a73e075f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388839/normal_5f9886ec1b0db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371269/normal_5f951ddd9fb4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401985/normal_5f91bc189f614.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5f86f67cc8f29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/64349215552.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/tisopidasodizogig.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/60010557955.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/pepiwilefixako.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/nitracion_de_alcanos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b17d588d-2a41-4780-9ff4-6018f06da393/58294950840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d33d8f74-a395-45a9-84c6-21ea2de1468b/49636009401.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_off0000543c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x543C 5352 bytes
SHA-256: 77e29bea03356192600b73b1c55dc35002aa78183229f78b353d956f69b750c6
font_01_sfnt_off0000664c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x664C 10236 bytes
SHA-256: 4ef6437ad804a5f743ce4e3c16e12ca7837f2c6f69ab37927cde9333995a5b49