Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e7a3a66f7a124c0…

MALICIOUS

PDF

36.2 KB Created: 2020-11-08 04:35:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 01ee11e51501bbc5666a62004ea3ec6b SHA-1: 15e77bea7cd01e095aec210e0a119173061f3ff4 SHA-256: 6e7a3a66f7a124c0e3841ecdb0494b545b62da55c8f35ff8fa0d235ed30151ba
154 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external PDF links, including one pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate malicious intent, likely to drive traffic to malicious infrastructure or manipulate search engine results. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to lead the user to a malicious site, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://traffine.ru/123?keyword=monster+hunter+freedom+unite+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370740/normal_5f926e4561b4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376611/normal_5f954cdc0a4e0.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/bidurudilidujug/39861741882.pdfIn PDF document text
    • https://delogifelet.files.wordpress.com/2020/11/hydrogenated_amorphous_silicon.pdfIn PDF document text
    • https://felumas.files.wordpress.com/2020/11/amalgamation_accounting.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/perfect_english_grammar_exercises_superlatives.pdfIn PDF document text
    • https://piwuloduvibi.files.wordpress.com/2020/11/darumejedad.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/worovafojekalewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9ce285d-d318-4fb4-8539-912b021ec849/53808949088.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/get_fit_stay_well_2nd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc6d66b3-2ca2-4dc5-8267-06a39640c212/pixixiterevegejawubu.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/beautiful_in_white_sheet_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/73788096097.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/what_is_a_sheriff_sale_in_pa.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_off000043a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43A2 3308 bytes
SHA-256: 1d819ca87307b0931dc210cc3a77fca1a196c83e48134c90c116c8e3ac090b83
font_01_sfnt_off00004f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F9E 5084 bytes
SHA-256: c9218e040eb7b97cbfe7372a9782ae1dd587cb32bb443a659bdbe79016630f2e
font_02_sfnt_off000060cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60CD 10388 bytes
SHA-256: 6ad19859c2309abe31d4908705178381521f2d578e40c6d29af9632e65bf9fd2

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