Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff38e634615dfee…

MALICIOUS

PDF

72.4 KB Created: 2021-03-07 19:34:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 82327f0f54761519dfc067cd41869e6a SHA-1: f828d75cbf026ade8544c0bcf54130a7275c1067 SHA-256: fff38e634615dfee3eaaf7f59c6f7a8e8782e91ce4ad9114afaa455e08715893
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a redirector to known malicious infrastructure. The document body, though heavily obfuscated, appears to contain product-related text, likely a lure. The ML classifier strongly indicates maliciousness, and the presence of numerous links on disposable hosting further supports a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/123?utm_term=sony+dream+machine+clock+radio+icf-c111 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4448720/normal_600c206428ccc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469126/normal_600b7c6442af7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412583/normal_603f75cc438fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386609/normal_60090801cce74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490370/normal_5ff7c81d5d653.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449783/normal_60158f7d588c3.pdfIn PDF document text
    • http://xulazawelinuze.scienceontheweb.net/57869265406.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475577/normal_602aaa805fba8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467273/normal_5ffea2375d05f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lanosebezazov.onlinewebshop.net/41774514356.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/sarurosunuzewuverogomedaw.pdfIn PDF document text
    • http://matasup.rf.gd/economically_weaker_section_form_2019.pdfIn PDF document text
    • http://fakodesugi.epizy.com/31666452627.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/wabenazomebinorovibito.pdfIn PDF document text
    • http://wadokeg.epizy.com/toro_power_max_724_oe_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/27336721796.pdfIn PDF document text
    • http://fuvituze.epizy.com/91772445343.pdfIn PDF document text
    • http://susesibukof.epizy.com/matsui_jurina_privacy.pdfIn PDF document text
    • http://ziketikivanodiw.epizy.com/767024981.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/payroll_implementation_project_plan_template.pdfIn PDF document text
    • http://wepaxilex.epizy.com/xokimunira.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_off0000dc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC44 5436 bytes
SHA-256: abeaa34adb19e1d5f9bfcb60e3a07d69c1a4b7c01a4fa6ad4614f074d5f85678
font_01_sfnt_off0000eeaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 11060 bytes
SHA-256: 3f0c37afd22791ca825f4f61f86de3f10f1452cdd23a703af1ff9c64f2991073

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