Malicious PDF — malware analysis report

Static analysis result for SHA-256 87439d535ae302d9…

MALICIOUS

PDF

49.9 KB Created: 2020-10-15 23:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4b6768c2eebde586fb007dc4c5a2b965 SHA-1: fe1e96a67cb9f1b8ee157cedefcce7f1a32e8bf1 SHA-256: 87439d535ae302d9cb54d20d22e6a14129719908f5c2dbdc7c19e3a226ed7cb5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded links, many pointing to disposable domains and Weebly-hosted PDFs, indicating a link farm for SEO manipulation or content distribution. One critical heuristic identified a link to known malicious redirector infrastructure at 'ggtraff.ru'. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=yamaha+c45+preamp+service+manual In PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/6431815.pdfIn PDF document text
    • https://kenilajapa.weebly.com/uploads/1/3/1/0/131069910/rizagepadimoj.pdfIn PDF document text
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/fd43eef71.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/tifuxasorelav-sunagutigu-gikisifexixabot.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/godekux.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/8ba85efefb.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/7989682.pdfIn PDF document text
    • https://gurigibafex.weebly.com/uploads/1/3/0/7/130739571/lefanogarufuvin.pdfIn PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/6578987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366407/normal_5f8758ab7d7eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5f87480326616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5f88574b96b5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369933/normal_5f8836034bfe8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5f875d42a9381.pdfIn PDF document text
    • https://site-1040571.mozfiles.com/files/1040571/6158523039.pdfIn PDF document text
    • https://site-1040221.mozfiles.com/files/1040221/nagipemefig.pdfIn PDF document text
    • https://site-1040528.mozfiles.com/files/1040528/66295101002.pdfIn PDF document text
    • https://site-1048168.mozfiles.com/files/1048168/wozewurufisotejojoti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/bf8d2cbc-23ac-44f3-9001-42a1aa812587/jefuleserebor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fff4bcb3-2bef-4a4a-9b3d-b24db0739993/74539221695.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8109/6096/files/minecraft_crossbow_recipe_1.14.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5172/0090/files/writing_linear_and_exponential_equations_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4768/0162/files/36611419791.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0565/9304/files/34017496674.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0352/6820/files/36423409199.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C90 5100 bytes
SHA-256: 828bcbc841d162b544706ef16d72061b093af0c645a8462edc86c7580fcd7958
font_01_sfnt_off00007db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB5 1936 bytes
SHA-256: b896cf420d67f16b10940560c9bed40f752809473624917c27c77593c290bb83
font_02_sfnt_off000086fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86FB 10748 bytes
SHA-256: dc1d8d961b0a6fb7b2dc6ea7e1373facfa679833953c1cb6845c48f4788ef8f2
font_03_sfnt_off0000ab5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB5F 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

Open this report in the interactive analyzer, or submit your own file for analysis.