Malicious PDF — malware analysis report

Static analysis result for SHA-256 772ea0b401566d52…

MALICIOUS

PDF

41.2 KB Created: 2020-11-08 02:41:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f90d84dcc3b472036e21ea16e78aebae SHA-1: c0c024e1d6d8cd457cc79a94a841c90bdd3d269c SHA-256: 772ea0b401566d520ab561a8127eb84d89f0b3421011db06db1aa151a12b21be
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on Weebly and Amazon S3, suggesting a link farm designed to attract traffic. The primary URL, trafftec.ru, is presented with a search query for 'facebook lite apk download for windows 10', indicating a lure for potentially unwanted software. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://trafftec.ru/123?keyword=facebook+lite+apk+download+for+windows+10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369332/normal_5fa4ff0ca724e.pdfIn PDF document text
    • https://jolefopasovoja.weebly.com/uploads/1/3/4/4/134402584/f587e.pdfIn PDF document text
    • https://mimoberojatef.weebly.com/uploads/1/3/4/3/134316463/69ac9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452373/normal_5fa71a6d995ae.pdfIn PDF document text
    • https://turetufifej.weebly.com/uploads/1/3/4/5/134500159/8f19f6635f4d04e.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/wozumadaku-mukevewurovebu-nefebo.pdfIn PDF document text
    • https://xekexudaxojow.weebly.com/uploads/1/3/4/3/134365032/kefujulo_kopamakot.pdfIn PDF document text
    • https://kejedavozeve.weebly.com/uploads/1/3/1/4/131483662/gebixapitujozekida.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/vavapekadoliti/apostila_auditor_fiscal_tributrio_municipal.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/exceptionalities_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/diabetes_mellitus_tipo_2_definicion.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/design_notations_in_software_engineering.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/budget_2019_free_download.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_off00006234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6234 5592 bytes
SHA-256: f7d9e9673e02ea04f3febbf85b6a4d13672cd1b4c079ff122714fe680b8ded13
font_01_sfnt_off00007562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7562 10420 bytes
SHA-256: 291dabc4a8c5e08da331ac0437c50a35a8b24a8d282b7f233990bcbf52d12917

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