Malicious PDF — malware analysis report

Static analysis result for SHA-256 b645b5ed4de9c878…

MALICIOUS

PDF

47.4 KB Created: 2020-10-18 10:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 077453ea91874284f0e6272e3afc0563 SHA-1: f4e4915025b0e3a81f0e3f07fea5623fdd9ce157 SHA-256: b645b5ed4de9c878e2505a6cd0b294a72f0c4e2acba96e1d4ce4fd0a34b369b6
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various disposable domains, indicating a link farm designed to distribute traffic to malicious sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms that at least one of these links leads to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the structure and embedded links strongly suggest a phishing or scam attempt.

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://ttraff.club/123?keyword=single+point+cutting+tool+practical+pdf In PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/611bef74.pdfIn PDF document text
    • https://gonoloxezejuje.weebly.com/uploads/1/3/1/4/131410007/9026572.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/nipomomuka_gisotufeje.pdfIn PDF document text
    • https://jikolugoxolij.weebly.com/uploads/1/3/1/3/131379047/1475678.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/7c2eb3c.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/divepubebi-lusabunuxoteb.pdfIn PDF document text
    • https://jobubati.weebly.com/uploads/1/3/1/4/131453688/linagavujonuwe-jovoxunufezesem-vapetid-kawofivute.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/9276260.pdfIn PDF document text
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/6186674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5f874fafb6381.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_5f8ba8ab807a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371269/normal_5f895313b59d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368481/normal_5f8777dc2a894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370525/normal_5f88918fee1b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377674/normal_5f8b452d41e26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5f877032228b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369498/normal_5f88142e83e57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365613/normal_5f8b3e6a194f5.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/2b985ee8-6241-401a-b310-86fe08840369/69346715480.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1db3203a-6ef1-4a47-89bf-b0126ca4f78b/pijejazesorawanel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c67d3a0-e69f-480a-b96d-e106cd1eb745/44723546784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc172081-b612-47d6-b6e7-e89fe45202eb/rulisuwiwiviji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/5540/8071/files/affinity_designer_workbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1138/6787/files/rilawan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/0507/7398/files/79378254973.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7961/2578/files/download_games_stock_car_racing_mod_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5017/5126/files/95835191555.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_off00007ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD5 5248 bytes
SHA-256: 727a8810c25b687a29ebd65327d597f075f351e91f51ee2d189e87e33b96f9f3
font_01_sfnt_off00008cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CBB 10260 bytes
SHA-256: 21d3983bf94baa1a77fe93ef99af5bc32460248d70a51098f8f4fb631d6acf9c

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