Malicious PDF — malware analysis report

Static analysis result for SHA-256 14c8e843c1a695f0…

MALICIOUS

PDF

52.2 KB Created: 2020-10-22 02:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c47d1a026286c6642d9db416e924dfb0 SHA-1: a183b1b0b471c207542cc81bd98468136374b5f5 SHA-256: 14c8e843c1a695f0cb9789217f427838b049d9f8715762231f691f6250b237d2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous embedded links, identified as a link farm, with several pointing to known malicious redirector infrastructure. The ML classifier also flagged this PDF as malicious. The presence of these links suggests an attempt to direct users to potentially harmful sites, possibly for phishing or malware distribution.

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://gettraff.ru/wb?keyword=frostfall%20load%20order In PDF document text
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/9148684.pdfIn PDF document text
    • https://nanorobudilason.weebly.com/uploads/1/3/0/7/130775181/ruvejipomuwekixuk.pdfIn PDF document text
    • https://zizuralozirufu.weebly.com/uploads/1/3/1/4/131483034/masobuden-wexov-tovafifinif.pdfIn PDF document text
    • https://zukamukenipebo.weebly.com/uploads/1/3/1/3/131380388/xufobetenu.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/63d400e.pdfIn PDF document text
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/witefukuri.pdfIn PDF document text
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/9539637.pdfIn PDF document text
    • https://jorimedazaget.weebly.com/uploads/1/3/0/7/130738946/6697967.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/7e67e026-3a4d-4174-aa4c-42a82174c875/53538993580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34037175-f9e0-4aad-a83d-eac8af28a828/86284196750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/056ef8a2-9204-446b-a65a-305fd01ca89d/factorio_programmable_speaker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dbedb62-20c4-4255-9b60-80b826477f64/fapok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02a04e5c-03d4-426d-a97d-ed514ca7150f/girefafiruv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/3454/8645/files/tebepedesuzidilam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1349/7251/files/16107276039.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1688/6678/files/proteinas_vegetales_texturizadas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/3921/0911/files/46613744733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e90a790d-271c-4f37-9e33-6b36f025f22c/figobawerofowixajegolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f90de912-c89e-45a2-bba3-48135fd4112a/80511899979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b0ae9e3-fcde-4f9a-bc2e-e8ce05f8d787/vesesugisedoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7022876b-bc5d-4ebc-b4b9-49fa61b551c3/descargar_project_2013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5ab3d61-524c-4c21-8d09-588cfd607f52/guvazewopavirulekulap.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9483 4856 bytes
SHA-256: fc7dc2dcc49dbb9003f2434e141301c7efc98e6cef65b2ea88c28aebc8b96c8f
font_01_sfnt_off0000a510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA510 10364 bytes
SHA-256: 9742a61fc94f1203976f51a36fafb718b0eea3951552e5fa9b3b5fec5a4cdca6