Malicious PDF — malware analysis report

Static analysis result for SHA-256 553ba7eea33d3fa4…

MALICIOUS

PDF

40.8 KB Created: 2020-10-10 15:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 37a44d7f12e62b02045b73fefe169117 SHA-1: 853039e5765ab79fe35ed7fe70263bc75dc45c72 SHA-256: 553ba7eea33d3fa489f48726ec2cd45fd166bda6d5206e0f4aed96dbe37f5df3
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to a warranty claim, suggesting a social engineering lure. The ML classifier strongly indicates maliciousness, and the presence of multiple links to disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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/strik?keyword=sunbeam+electric+blanket+warranty+canada In PDF document text
    • https://site-1042978.mozfiles.com/files/1042978/selixudapivetagapufegexex.pdfIn PDF document text
    • https://site-1036742.mozfiles.com/files/1036742/pidomezenof.pdfIn PDF document text
    • https://site-1036724.mozfiles.com/files/1036724/68422897010.pdfIn PDF document text
    • https://site-1038416.mozfiles.com/files/1038416/lajola.pdfIn PDF document text
    • https://site-1036945.mozfiles.com/files/1036945/nizuzodi.pdfIn PDF document text
    • http://files.aestheticstateofmind.com/uploads/1/3/2/6/132682137/ac6d5760.pdfIn PDF document text
    • http://gagon.spchevariecossette.info/uploads/1/3/0/7/130775192/rasavifofor.pdfIn PDF document text
    • http://lenofok.oakleyboycott.com/uploads/1/3/1/4/131438216/manitemeregudol.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/1/0481/4471/1847/files/shady_dragon_inn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b14563ba-17f6-42ee-b716-42a197c87313/xitoxisaxulajoxoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36e25637-bc41-4331-8f4a-85914822ea63/21507931934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cafda203-2793-466e-9be6-3801ee19a011/zuwopabuf.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_off00005f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5F 5408 bytes
SHA-256: b5155c5d05acead599cc52a60c86b3ba0de45d460ac51c55808b78c11752811a
font_01_sfnt_off000071be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71BE 10708 bytes
SHA-256: ee66aff82694593d09aa72b6b3671e6ab6dffe5723549f2df1dc13c96420b5d2

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