Malicious PDF — malware analysis report

Static analysis result for SHA-256 757801a7eab8a9bf…

MALICIOUS

PDF

65.5 KB Created: 2020-11-20 06:56:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7a0c68dc7cb29f7a817a31d3c8628c4 SHA-1: 73a02dd17273b619f48662742e412d8eb2d66888 SHA-256: 757801a7eab8a9bf0e9e172316910402ad6eaab606277285647b5f7a06b3ac04
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to disposable hosting services and a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to a refrigerator manual. The presence of numerous external links suggests a link farm or SEO poisoning tactic to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/123?utm_term=ge+monogram+refrigerator+owner%2527s+manual
    • https://waxatuvew.weebly.com/uploads/1/3/4/3/134371429/tatavuvozaxuwesitave.pdf
    • https://wopadutizibum.weebly.com/uploads/1/3/4/3/134306931/8221152.pdf
    • https://fetofopup.weebly.com/uploads/1/3/4/5/134507679/835055.pdf
    • https://pimizotola.weebly.com/uploads/1/3/4/7/134770615/buxoniw.pdf
    • https://cdn-cms.f-static.net/uploads/4367013/normal_5f873f22e8829.pdf
    • https://nopirirog.weebly.com/uploads/1/3/4/2/134234714/510486.pdf
    • https://padazuvotoj.weebly.com/uploads/1/3/4/6/134687326/gajida.pdf
    • https://cdn-cms.f-static.net/uploads/4414677/normal_5fa948201aea3.pdf
    • https://kasukironumasex.weebly.com/uploads/1/3/1/4/131454791/metekesalaran-gimigowirokege-gavirepivedoz-wuwugemirokuz.pdf
    • https://forajezar.weebly.com/uploads/1/3/4/1/134108615/mizulogidezesidetat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6622c53a-4ba9-413f-b190-0ffbe8303ed0/958423544.pdf
    • https://uploads.strikinglycdn.com/files/0b57358b-bddf-4834-a5a6-3958a8afc1d3/indoor_shrimp_farming_guide.pdf
    • https://uploads.strikinglycdn.com/files/62b8eda9-108b-42ce-9d71-e3aa66f40c60/dexudaletidop.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2d2.bin
5cb70b94e5e7b9a8e0b298afdee951f0563d286507044fcc6b77b14272d0343a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D2 5244 bytes
font_01_sfnt_off0000d4b0.bin
742e5aea91fe1662159634b1eec17a01c6559f72bb007ce03d4d15c371931c8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B0 10692 bytes

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