Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15116aeaac9a61f…

MALICIOUS

PDF

74.4 KB Created: 2020-11-01 11:13:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 61bd554c786c2c5c373f8501a775e703 SHA-1: c2cc0d8ac3118ff3f09ba8a726dbc54f28576597 SHA-256: d15116aeaac9a61f4ce4b2923723954e8fa08d594e21aed3682d155ba4a5fcb0
184 Risk Score

Malware Insights

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

This PDF document is classified as malicious due to its function as a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains a URL that is also flagged by heuristics as a malicious redirector. The ML classifier strongly supports the malicious verdict, indicating a high likelihood of malicious intent.

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/aws?keyword=fermi+level+formula In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409096/normal_5f9e730e0e4e3.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/1934314.pdfIn PDF document text
    • https://zalawevovupat.weebly.com/uploads/1/3/0/9/130969727/vujew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379221/normal_5f8b9b557d55d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391302/normal_5f959ada9cdd7.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/kavavevulufaz.pdfIn PDF document text
    • https://poxobavu.weebly.com/uploads/1/3/1/4/131453713/bokefepibumagaxe.pdfIn PDF document text
    • https://xigodawi.weebly.com/uploads/1/3/4/4/134464905/pavumos-ravuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393916/normal_5f9b8e96363ca.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/1/0497/9739/8689/files/internet_slang_dictionary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/5802/0519/files/wepekasotakidepo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3990cad-c1fd-400b-9106-473fb37fa6ae/gitutiziworixibere.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000ec75.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEC75 27336 bytes
SHA-256: 58bbd72fed965e7c889decf9e3b46ada0bac207808bfcf65f4900a1eed4c16e4
font_00_sfnt_off0000b275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB275 4752 bytes
SHA-256: 5381cfddc0880538291a40819eff1d647e94a5324242567f17433303ab317e9b
font_01_sfnt_off0000c290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC290 12152 bytes
SHA-256: 2d3d9d1f83ad98729a5a204d78ca57e4f48fa004ee4d9a2290d1f086570ae384

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