Malicious PDF — malware analysis report

Static analysis result for SHA-256 3258c1ed8a926cdb…

MALICIOUS

PDF

43.1 KB Created: 2020-11-01 09:41:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fa6d31007eb2fc8c6a00ab8208a37969 SHA-1: 3fd7c5d013e7de7101797db7350cb4f01deb8336 SHA-256: 3258c1ed8a926cdbbce6a8d61834f11189015cd9bba6d99a20bae9b743eb376d
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 malicious redirector link disguised as 'Constitutional law final exam answers'. This link, 'https://ttraff.club/123?keyword=constitutional+law+final+exam+answers', is flagged as malicious. The document also contains a large number of external PDF links, many of which point to potentially benign resources, but the primary malicious link is the most concerning. The ML classifier strongly indicates maliciousness.

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=constitutional+law+final+exam+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_5f8b5c2aefe1b.pdfIn PDF document text
    • https://bivixogerixud.weebly.com/uploads/1/3/4/4/134469213/6406543.pdfIn PDF document text
    • https://garagagu.weebly.com/uploads/1/3/4/3/134364865/e42cce68.pdfIn PDF document text
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/xupipib_vemopunakigagiv_muguje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370072/normal_5f9dd81e4a57f.pdfIn PDF document text
    • https://romovemesokawaj.weebly.com/uploads/1/3/4/4/134479736/relelakuguxux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/0900/3687/files/economic_analysis_of_law_posner_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8691/2413/files/durability_of_concrete_structures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee39de00-2c37-4792-b332-2f01e27cc930/55365507564.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bdf0c4c-c59b-4721-b8ff-0da4fdd449d0/idealismo_platonico_caracteristicas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/9810/0665/files/omb_circular_a-87_superseded.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfbf0eb5-8b0f-4943-8675-1cf8e7212a75/warum_hat_hardi_pietsmiet_verlassen.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_off000069e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69E2 4976 bytes
SHA-256: 6eff6f036eeb0de3f70c43e143adc99b1b74852a14cc8f073041ac9f43402b3a
font_01_sfnt_off00007acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ACB 10800 bytes
SHA-256: b409e4dcdebb4900e832432f2d417e9b4ef0137a09de673fc6e7a14ea906638b

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