Malicious PDF — malware analysis report

Static analysis result for SHA-256 3713fc3a4966387d…

MALICIOUS

PDF

41.3 KB Created: 2020-10-06 11:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 635c1a8f6618e02f9a6a329177bec348 SHA-1: ff3305ff73408ac2280febdd796ce44617bb48d1 SHA-256: 3713fc3a4966387d2021db4854fd6ba76052f0ff951be9f63ea635a7ddd0fb82
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one specifically identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that likely serve as lures or redirects to malicious sites, aiming to compromise the user.

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://ggtraff.ru/strik?keyword=acls+2018+espa%25C3%25B1ol In PDF document text
    • https://site-1042629.mozfiles.com/files/1042629/38060694403.pdfIn PDF document text
    • https://site-1036987.mozfiles.com/files/1036987/84832476202.pdfIn PDF document text
    • https://site-1038478.mozfiles.com/files/1038478/52106160992.pdfIn PDF document text
    • http://texuxa.camptownmarketing.com/uploads/1/3/1/6/131607163/3955468.pdfIn PDF document text
    • http://fadeseje.cardinal-woodcraft.com/uploads/1/3/2/8/132815015/janebe.pdfIn PDF document text
    • http://rivogu.sophiamulheran.com/uploads/1/3/0/9/130970009/winum.pdfIn PDF document text
    • http://files.myfirstroots.com/uploads/1/3/0/7/130739478/b9f2f3f7.pdfIn PDF document text
    • http://wetina.naturalhealthperth.com/uploads/1/3/0/7/130739616/lalefexovuze_vatabifewaka_kurodupir.pdfIn PDF document text
    • http://wakoj.nchep2017.org/uploads/1/3/2/6/132681513/kigidi-joroxugew-pexovonarup-saxawegurewa.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/2506ce64-8e22-4566-9b50-9eb7e578e991/25711169811.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf5f1cde-b418-4ac0-b6aa-07c9f61c49a7/14619290106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a52bf90-b452-4d55-956f-a7430536dbb7/razelazagegoxasifupexagek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c53c1c00-d520-4733-b2ca-adf60d407b66/niwegazemokifibumufego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e9071a9-8485-4544-9bb9-b07d8f9d4c9b/25273093178.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_off00006103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6103 5552 bytes
SHA-256: 4fcea709f02d03aa4ad569478a79d39413978c8606225985e6f5b2cc66590f6d
font_01_sfnt_off000073c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73C3 10492 bytes
SHA-256: 80a22fcd29c255878e28eeeaf8398a022437944cec9e3e09700436c116e670cb

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