Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb4e163b990694c…

MALICIOUS

PDF

50.7 KB Created: 2020-10-18 04:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5e63ef8e177157357636b42d78b3861f SHA-1: 9c5a036ee2ac55f47f446f285117c45beaf42aef SHA-256: 3eb4e163b990694c03b11f370ce0eeb9863e9f1c20fec36282134042ebc52486
184 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as a driver download for 'tp-link ac1300 driver windows 10'. This link redirects to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the target URL.

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://gettraff.ru/strik?keyword=tp-+link+ac1300+driver+windows+10 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_5f8b951e1a8e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_5f88a78159205.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5f87ac7e1951e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374360/normal_5f8a9717e9ee2.pdfIn PDF document text
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/fosolujovatej-puxubawaratob-jamipemebujube-bipenu.pdfIn PDF document text
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/8160160.pdfIn PDF document text
    • https://mixorone.weebly.com/uploads/1/3/1/4/131438240/sexamaxab.pdfIn PDF document text
    • https://tugajepefur.weebly.com/uploads/1/3/1/4/131453805/muxomidofi.pdfIn PDF document text
    • https://mikazeral.weebly.com/uploads/1/3/2/3/132303371/laxugixixi-visivorugil.pdfIn PDF document text
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/fulekoxa-susupol.pdfIn PDF document text
    • https://xazapadikud.weebly.com/uploads/1/3/1/8/131871762/sajototomutovubu.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/bbfc5ad5-e4a7-420f-ba17-3fba1f92bffa/27608014649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/156b6f64-5911-493f-b361-1eb435d0fa47/71173158069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ed2e9be-a493-45c2-b40c-3c3324b5e7b6/56455111421.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0212432-1d73-4923-b810-ebc532d5a84e/wumugusemere.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3071/5288/files/darkest_dungeon_bosses_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4916/2654/files/aroma_rice_cooker_instructions_4_cup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/82899296664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8105f533-e46c-4e97-830e-624460a288e2/96429268122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/949b25c3-8516-4b48-889b-9189fa401d51/nijele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ef63c7a-e1c6-44aa-af5e-98bd4f1a2b1c/78883320480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ea5855b-0f9c-4c79-8136-351cf6430393/37270383831.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78C8 3796 bytes
SHA-256: 1678b56e410b2ab214cc6beb4d5fbf344c349cb5a65623699faa7e8b0423253e
font_01_sfnt_off00008664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8664 5624 bytes
SHA-256: 34d95bd79778b0b74cea015355af7be902aa08a8b1b2ffe695def23e25b0c9e2
font_02_sfnt_off000099a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99A8 10324 bytes
SHA-256: 4e86c68cff0806ebfec616de764267e1a8eb35de75c4b38c11d1bd6ae5c1cb68