Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8670d53071db7d0…

MALICIOUS

PDF

35.4 KB Created: 2020-11-07 01:21:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e7670f8ed16afcda1fea2b2c28402e33 SHA-1: 13f3aa7c6fd2d1d34a2fb3dbd98e4ac23dfa8d28 SHA-256: a8670d53071db7d0f186548b76d9ee654a42eed4761ec49b453cdd089bbfd0b2
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to other PDF documents, a technique often used for SEO manipulation or to distribute malicious content. The primary URL, https://trafficel.ru/aws?keyword=new+empty+dataframe+python, suggests a potential lure related to programming topics. While no scripts were directly extracted, the PDF structure and extensive link farm indicate a malicious intent to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/aws?keyword=new+empty+dataframe+python PDF link annotation
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/sidobojugonuxexoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417222/normal_5fa19b931ac35.pdfIn PDF document text
    • https://tojopuxibo.weebly.com/uploads/1/3/4/2/134265943/nalike_munojobozozekew_nigefaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372702/normal_5f8e03bbaea08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426075/normal_5f9a77d9510de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416149/normal_5fa17265e738f.pdfIn PDF document text
    • https://tetagusupawuwag.weebly.com/uploads/1/3/4/5/134586179/motavijolajubokosene.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tirosagumeta.files.wordpress.com/2020/11/12005768388.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/rezurikuxoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/665ee41c-8a0e-4b02-8c10-0fb8af0a13c3/dogiru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/120485bc-9b5f-49ae-abed-4f5bfbc06290/zipole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/481123c0-7264-4b14-a6db-4de8b6e0ab5d/bivelasulojixijepur.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_off00004c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C4F 5232 bytes
SHA-256: 156b7b6f0f9dec8f7dd2273044a992da024aa48e28534193903810989040be19
font_01_sfnt_off00005e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E12 10280 bytes
SHA-256: d47b186adbdf1fd88454b81e75b3644098be649328991221a4cfb7dc250bf7cf