Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9395407985bdf6a…

MALICIOUS

PDF

51.2 KB Created: 2020-11-03 05:20:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2b53a86b7a62afdfa4306767f654a49f SHA-1: dd1f0319101c01ea6540237d171c172df017308c SHA-256: d9395407985bdf6a88f6fe12c4c136a1a9a091f3235b8e8e1e9d40721ee2bbdf
154 Risk Score

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.club/123?keyword=nursing+care+plan+pocket+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379045/normal_5f9d7f9111c92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_5f8d49fd72a81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372360/normal_5f8bbfef43487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386594/normal_5f9e15862b417.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/443abbd4-48a5-4a3e-b291-9f5971a2b817/massey_ferguson_30_industrial_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/008ea1c9-24ad-4be9-b25f-2681409205df/the_politically_incorrect_guide_to_immigration.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2936/4387/files/just_like_this_train_lyrics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/6923/3094/files/27632374300.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/28605871724.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2570/9246/files/a_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cfd473d-b11f-488d-9596-507fe304bc25/ginojanavonebal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b97bc4e-48f4-462a-be2c-b32a11a4c6a5/17967187509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b060a0b-8964-4582-8556-65f6d83e24d0/rejitepagenigadasafujuba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6009/2315/files/how_to_get_a_receipt_from_amazon_app.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_off000087b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87B3 5272 bytes
SHA-256: 112ba5b4dbe8ae2b21488248f200c16e623b4132b8e62ff1abc15d6139ce1be8
font_01_sfnt_off000099ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99BA 11300 bytes
SHA-256: 89fdb4fda0ae704de16367db4c2c1e132f30d49f6c09647c681c1b625fc43fc6