Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f16d81ff1e143e4…

MALICIOUS

PDF

47.6 KB Created: 2020-10-28 08:28:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b28f49304157301391b2f0b0ddaa5f24 SHA-1: 1630c19238689ffb08fb0c6102bfc6652231a707 SHA-256: 9f16d81ff1e143e438b498b731cad709dfe64c7a0fbd66811bc44ddac8efe0b6
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external websites, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and embedded links suggest an attempt to redirect users to malicious content or phishing pages.

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://cctraff.ru/strik?keyword=liberal+humanism+theory+definition In PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/lebatarebi.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/fdb97aa.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/fugobinadumi.pdfIn PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/valatulelaxepal.pdfIn PDF document text
    • https://fojejebub.weebly.com/uploads/1/3/4/2/134265807/015db6.pdfIn PDF document text
    • https://vogoworelo.weebly.com/uploads/1/3/4/2/134266182/suzozitiroxafutes.pdfIn PDF document text
    • https://zadujemerumid.weebly.com/uploads/1/3/2/6/132695269/8209595.pdfIn PDF document text
    • https://pojarepuvoweru.weebly.com/uploads/1/3/3/9/133999230/4f8008400201f6.pdfIn PDF document text
    • https://jozokuxig.weebly.com/uploads/1/3/2/8/132814463/82bd7.pdfIn PDF document text
    • https://mogidudurunupiz.weebly.com/uploads/1/3/2/6/132695636/warudogi-jutuki-baboxivux-xumatirogik.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/kijozikinipufopuxax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/fokizonogatavikir.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/dafuxujodax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35a9ddb2-aa18-4809-8b30-14449503796b/mimisawan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc5cd850-f49d-4c15-8936-60d7b86a5685/pezazogatakela.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/biodata_format.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/lopesimosimurugikodaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/magazine_article_writing.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/banking_exam_study_material.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_off00007b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0D 5332 bytes
SHA-256: 3a48ed6d4e9f81ab68901a88c4d97f75d31327735cbc9d6102b8c28b343a3c52
font_01_sfnt_off00008d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D03 10696 bytes
SHA-256: 33f1652511b7f9939f6fdd9ce5e3d9369733286f0ac7f34b8220bf529a902c18

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