Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4283b20400a3a7…

MALICIOUS

PDF

53.8 KB Created: 2020-10-28 14:30:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 183250ed21248e0bd1d4127aaccc2d95 SHA-1: 275f10264215d4c78e018a9e41a465d8b3779737 SHA-256: 9a4283b20400a3a7f7570fe6974b3a61f55fbecf90d6f03f833d3134e4fc5c25
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to a redirector infrastructure. The primary malicious URL, 'https://ggtraff.ru/strik?keyword=ancient+sealed+curses+minecraft', is presented in a way that suggests it is a search result, likely to lure users into clicking. The ML classifier strongly indicated maliciousness, and the PDF structure itself is indicative of a link farm or redirection tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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://ggtraff.ru/strik?keyword=ancient+sealed+curses+minecraft In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_5f9934bd3c1b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412568/normal_5f9429542f294.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/govelupobusufop-gedozonaxenulu-xonere-netarawigi.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/8980310.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f873c866cbcf.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/widesisiba.pdfIn PDF document text
    • https://subarijarasojud.weebly.com/uploads/1/3/4/3/134332778/kujozad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375095/normal_5f91143dbe3fe.pdfIn PDF document text
    • https://norumevi.weebly.com/uploads/1/3/0/9/130969469/bagofexuzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393752/normal_5f994b5425992.pdfIn PDF document text
    • https://pakezumada.weebly.com/uploads/1/3/4/3/134368128/jamugimabadotixi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5f993410872e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406473/normal_5f953695de707.pdfIn PDF document text
    • https://kawuloxegulul.weebly.com/uploads/1/3/4/3/134389306/gatokakepafepo.pdfIn PDF document text
    • https://fevijalefo.weebly.com/uploads/1/3/4/3/134383315/rorikipu.pdfIn PDF document text
    • https://rudofodirofebas.weebly.com/uploads/1/3/0/7/130739781/1325453.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368997/normal_5f9824ea41a61.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/purufiz/road_accident_statistics_in_india_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/atlantic_slave_trade_test.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/windsor_knot_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/rotafasaniz/29813430030.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/tratamiento_absceso_perianal.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/64958045894.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/guxagu.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/relationship_of_archaeology_with_anthropology.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/catalogo_de_cuentas_definicion.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_off00009206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9206 5156 bytes
SHA-256: d307942e5c64001dfcdf3d4db5e353559721c4335ba73f236c6ace6a366c8433
font_01_sfnt_off0000a37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA37B 11148 bytes
SHA-256: 79a3cd08e661ab5dd8d4e50416831aa9e49960f97cf03149d93f112f87820d25

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