Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3107eb82dc5eb71…

MALICIOUS

PDF

47.2 KB Created: 2020-10-15 16:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 764bc3da8c4c6e719274afda6c27077b SHA-1: 60060a11dcdff9c1ea820f1d7c92de0f7e097559 SHA-256: c3107eb82dc5eb715331e822af5731d473a52043de42505311138a458cb26fc0
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and are likely part of a link farm. One critical finding indicates a direct link to known malicious redirector infrastructure at https://cctraff.ru/strik?keyword=easy+napkin+fold+pocket. The ML classifier also strongly flagged this PDF as malicious. The document's purpose appears to be to lure users into clicking these links, potentially leading to malware downloads or phishing sites.

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=easy+napkin+fold+pocket In PDF document text
    • https://berajuvexoru.weebly.com/uploads/1/3/1/8/131860787/46f53e5125.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/613a711ec7ef.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/zanazanekoxel.pdfIn PDF document text
    • https://gikoberi.weebly.com/uploads/1/3/0/9/130969260/tagovudi.pdfIn PDF document text
    • https://site-1036833.mozfiles.com/files/1036833/69563785892.pdfIn PDF document text
    • https://site-1044455.mozfiles.com/files/1044455/4716897957.pdfIn PDF document text
    • https://site-1042016.mozfiles.com/files/1042016/gurusoxavij.pdfIn PDF document text
    • https://site-1043080.mozfiles.com/files/1043080/gogukoxunarufipime.pdfIn PDF document text
    • https://site-1036729.mozfiles.com/files/1036729/93181697365.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_5f871bcd7df89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368731/normal_5f87ba960c867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_5f87363f334fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368964/normal_5f87ded68a2bb.pdfIn PDF document text
    • https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/papijifepenup-mogewesode.pdfIn PDF document text
    • https://lasajiboz.weebly.com/uploads/1/3/1/3/131379041/jujivad.pdfIn PDF document text
    • https://xusawoji.weebly.com/uploads/1/3/0/7/130739635/lejevi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0479/3833/8972/files/36900138708.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1887/8104/files/diccionario_ingls_espaol_gratis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2570/9211/files/xokapokipewajodupededekil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3973/6487/files/soon_go_bike_speedometer_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00679e8a-640a-49ff-a551-6aba915e648d/3503703779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7dbda9c-3285-49b2-bf7f-526145274b5c/ragax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8734dcde-7760-4c7e-a9bf-bd692fd350e7/82230646985.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D85 4964 bytes
SHA-256: 7cff63cf6ee8f66370c056d2ddc9f962991a9bbf5ec3fe5633822ffc09035b0e
font_01_sfnt_off00007e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E82 10312 bytes
SHA-256: 53c9afaa5bf47219193ba9c3230e6fac56730c421f88a7e5dab4109e7191fd73
font_02_sfnt_off0000a1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA1B8 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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