Malicious PDF — malware analysis report

Static analysis result for SHA-256 69a0add059d41a5a…

MALICIOUS

PDF

35.7 KB Created: 2020-10-19 13:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e5dae1edf32d488083f7329406063744 SHA-1: 5d2b44ca8703e70f02ed668ff6f8df58ec33d495 SHA-256: 69a0add059d41a5aa833b3456e48cc33c67578a06ac6823da42a8177be38de58
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious due to a high number of embedded links, many of which point to redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to manipulate search engine results or redirect users to potentially harmful content.

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/strik?keyword=method+of+movement+for+marimba+with+590+exercises In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5f8d140f3044e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_5f89150294191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376358/normal_5f8a9450bc2f9.pdfIn PDF document text
    • https://biwugina.weebly.com/uploads/1/3/1/1/131163984/4721261.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/44d87feaf8ee.pdfIn PDF document text
    • https://ruwopevod.weebly.com/uploads/1/3/1/3/131397973/tulozajew.pdfIn PDF document text
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/1526823.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365635/normal_5f87e37403cf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368750/normal_5f883c43c1eae.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/tisaxuwabu.pdfIn PDF document text
    • https://vodiwisilob.weebly.com/uploads/1/3/2/6/132681054/mipakowavovivajabi.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/zerugijo_kebejanukuxu_gonejad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3189/5457/files/75466167490.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/2166/4160/files/89190969130.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7777/7061/files/37859407159.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6898/3969/files/83143327061.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7180/6366/files/vudu_movies_missing_from_movies_anywhere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa697f8d-f183-46f1-ab0b-36b59e5622df/88936803677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c63e5498-d5ab-4b25-9fb8-806b8c220fd4/rejimomaluse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/564f7d2a-b679-4c30-bcff-180e82603f45/fejesoketik.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_off00004b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B3D 6016 bytes
SHA-256: b4bc3d92b337b843eb802f22d611e9296369ca9e93a81c0c25c4c2b424ffd755
font_01_sfnt_off00005fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB0 10132 bytes
SHA-256: bbfa5181d735ca93c01ad21b54c3d5e269c5b1189b5fb0020e97f67615a90d88