Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba09fb7445fcd908…

MALICIOUS

PDF

54.8 KB Created: 2020-10-03 00:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9b4a6ac86f0029a4c212089be7b13a61 SHA-1: 5cafa6c7ed4dc7797cb80ea8011dd28130a38aaa SHA-256: ba09fb7445fcd908eaacc57b2743c2f2ffd31107e7b758ace6fd383ec1072769
184 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting domains and are likely part of a link farm. One of the embedded URLs, https://cctraff.ru/strik?keyword=victor+rubio+ragazzoni+auditoria+administrativa, is identified as a known malicious redirector. The document body, though heavily obfuscated, contains references to these URLs, suggesting an intent to lure users to malicious infrastructure. No scripts were extracted, but the PDF structure and link farm heuristic strongly indicate a malicious intent to redirect users.

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=victor+rubio+ragazzoni+auditoria+administrativa In PDF document text
    • http://files.knightsgambitvineyard.com/uploads/1/3/1/4/131411896/4993261.pdfIn PDF document text
    • http://zigetuwa.kovanis.com/uploads/1/3/2/3/132303307/gopaz_dumagebu_paresodom_vopisoredunune.pdfIn PDF document text
    • http://files.whyriskit.ca/uploads/1/3/0/7/130775934/ddc37973cc67d2f.pdfIn PDF document text
    • https://site-1037884.mozfiles.com/files/1037884/8762783237.pdfIn PDF document text
    • https://site-1037022.mozfiles.com/files/1037022/72884538817.pdfIn PDF document text
    • https://site-1036694.mozfiles.com/files/1036694/sodig.pdfIn PDF document text
    • https://site-1036907.mozfiles.com/files/1036907/dolejezoxebazivogepuxewe.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e2828906-d62c-44c3-89ff-97586ae42dbd/woganelixowug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab410430-f233-4247-aefc-69a0dd9c00db/22777121888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35ce23b5-4c20-4bdb-a172-26e87663a56b/15786874171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11187597-1a32-4838-9ed8-7bddbc6bf321/fezukaxasoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72d645d8-fc96-4208-8b97-9d5ab0ecf02a/zefepejadodofawofutadivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/685f06b4-f656-47ca-9bda-a3b58378680a/68746105736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/964e15cd-b8c0-466c-a9ae-57720e448317/garonawidorobivur.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
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBB 1644 bytes
SHA-256: 37c24baa18d0073ec8030c3588704cc78396206b8b2b974af8757a8904f74525
font_01_sfnt_off000074f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74F6 5208 bytes
SHA-256: 61b640e0bd99ce8017c73e6381ba7a5dd0c0e0c951fe50efbb54f1c6f0f4c635
font_02_sfnt_off00008694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8694 8976 bytes
SHA-256: e6ef1070fe110e09fdf6bef938d0dd901ba4047105bbf626610727e05d38d2aa
font_03_sfnt_off00009855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9855 11548 bytes
SHA-256: f846fdaf1bab2bc005a1038408dc4a1197e451de87e43e14badd596fcdd3a2b0
font_04_sfnt_off0000bf11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF11 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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