Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8c86a307703189…

MALICIOUS

PDF

48.3 KB Created: 2020-11-09 13:04:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9570e89ba29f86c9922e5dcb65f7ff88 SHA-1: ba3ff5438d0b837b56e86d17a0b1f250019945ec SHA-256: 4f8c86a3077031894dbaf43b0c914e092c768327f6d5ef2e27415b8659f3055b
192 Risk Score

Malware Insights

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

The PDF document contains a link farm designed to redirect users to potentially malicious websites, including one identified as a redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of this lure. The presence of numerous links to disposable hosting and a known malicious redirector indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffmen.ru/aws?keyword=nfs+car+games+free+download+for+pc In PDF document text
    • https://bujugerevik.weebly.com/uploads/1/3/4/6/134677448/zusixolijireti.pdfIn PDF document text
    • https://sifizebutu.weebly.com/uploads/1/3/0/8/130814914/a4987b584f8cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402504/normal_5f9898dcb4497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_5f8b9e6b80506.pdfIn PDF document text
    • https://zutofamofiselas.weebly.com/uploads/1/3/4/0/134040676/pibigofezutivuta.pdfIn PDF document text
    • https://fozufamegevavup.weebly.com/uploads/1/3/4/5/134586639/8703475.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/2069320.pdfIn PDF document text
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/biwuvuson.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/fuwawibu/gevuratafozojarobanabi.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/important_days_and_themes_2019_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/32138429509.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_off00007dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DCD 5536 bytes
SHA-256: d1393e6f0dd7cb6d0c4e3000ac29bf08e3c80022c06b15e1085dc1a23b6ecd97
font_01_sfnt_off000090aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90AA 10432 bytes
SHA-256: 18bed8214402e0a916ce5ef14db898965d78b61d7bc623aaacb2dae01fd258cc

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