Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca0b8d3c48a7c25…

MALICIOUS

PDF

47.0 KB Created: 2020-10-31 05:45:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4bfe2a6e811862860af98a6015669201 SHA-1: 9149e611b92bb01f17f26a2a3d2e63dc5ce925fd SHA-256: eca0b8d3c48a7c255195b26dedc384daf83b5a487107246617af26f42affab2e
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://ttraff.cc/123?keyword=how+to+become+a+tv+writer+in+india In 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/susopuzupure/pesomopenotajub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/4849/0915/files/90997145981.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2903/6199/files/mufibeluteworemak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/8811/5392/files/android_alertdialog_custom_listview_example.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/68687470878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c7d9178-2148-4b9a-8801-c64c70a61c66/lujozupozifipometomabav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7494/4153/files/85536558200.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/5271/7982/files/recycle_code_number_4.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/gowawozeroturonuk.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/vocabulary_in_use_advanced.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/36629483944.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_off00006cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBA 4916 bytes
SHA-256: 031fe4445b4bdd3d85c6152350100a4d832280873edb7092de3742314bfae07c
font_01_sfnt_off00007d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D5E 10368 bytes
SHA-256: 6c89c28d19483e83215fe42791bb62c9f21f7a88f1397354e48a6deaf9d51fcf
font_02_sfnt_off0000a0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0CB 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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