Malicious PDF — malware analysis report

Static analysis result for SHA-256 635a509601248852…

MALICIOUS

PDF

48.1 KB Created: 2020-10-22 23:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 90654d385ddb2ccc5dba1804f1eb0414 SHA-1: d93a656e94d0e85f38640c64f62b7253e3835c99 SHA-256: 635a509601248852c873cde9d86ed41b5d6e469e65458102cc17750a784b90b5
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://gettraff.ru/123?keyword=bogy%25C3%25B3+%25C3%25A9s+bab%25C3%25B3ca+k%25C3%25B6nyv+pdf In PDF document text
    • https://xonuvalax.weebly.com/uploads/1/3/1/4/131437330/misog.pdfIn PDF document text
    • https://tunomofezu.weebly.com/uploads/1/3/2/3/132303147/b05e93079e8a3.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/1994957.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/bosilo_ginasesif.pdfIn PDF document text
    • https://raxiruzaxulam.weebly.com/uploads/1/3/0/7/130738564/xotusixagupivim-wodelajugefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369324/normal_5f8816b6d4ea4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384482/normal_5f8c192e434e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_5f88991329f09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375690/normal_5f8f2a4abf564.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f8705dc93fc1.pdfIn PDF document text
    • https://wegotutitupal.weebly.com/uploads/1/3/1/4/131453182/2836001.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/wotareropajewub.pdfIn PDF document text
    • https://kiseridebajesa.weebly.com/uploads/1/3/1/4/131408791/8895565.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/memul/baroduvekugumuluj.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/familia_bombacaceae.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/6007650798.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/69750466386.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/road_and_building_engineering.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/40670772247.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/nanexobedusomaket.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/black_s_law_dictionary_editions_1-_9.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/oxford_dictionary_english_english_download.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/45819715906.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/banking_system_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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B19 5568 bytes
SHA-256: 5e06953936d571123252f3536123cce7c5999c9be051cc09588049fcd707b32a
font_01_sfnt_off00007d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D90 11860 bytes
SHA-256: e1fa17ee5ce7dc811dafa1b2ee28247809324462265105639d62fab4cf37e0b4
font_02_sfnt_off0000a2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2EB 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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