Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e15a9f91664e72…

MALICIOUS

PDF

73.6 KB Created: 2020-10-28 16:01:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edefb88dbc42ca47662a0648813898f2 SHA-1: 14d425e959bf3cfe03f2802765a12059b1ec7442 SHA-256: 31e15a9f91664e7207c925e2d969e599f6bfe592e9d5ddc9dc45faf74f772440
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that is also flagged as malicious. The ML classifier strongly indicates maliciousness, suggesting the PDF is designed to redirect users to harmful content.

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=self+esteem+in+sports+psychology
    • https://cdn-cms.f-static.net/uploads/4382190/normal_5f9085282efcb.pdf
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/66f9947149ff2d.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/vunidixeviro_xitosujitupile_kadape.pdf
    • https://pevinuwipe.weebly.com/uploads/1/3/0/8/130873962/3740324.pdf
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/8477310.pdf
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/fabf5383a5d6.pdf
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/7259215.pdf
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/2b34abe251.pdf
    • https://cdn-cms.f-static.net/uploads/4375340/normal_5f8f5eba858ad.pdf
    • https://zinawadasug.weebly.com/uploads/1/3/4/3/134312837/nefolajoweka.pdf
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f8b3382ed309.pdf
    • https://kivuligob.weebly.com/uploads/1/3/0/8/130874143/c814d.pdf
    • https://desaviguwogo.weebly.com/uploads/1/3/1/8/131871994/jifoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9c602fd4-c0de-4a8f-994e-0cb5872979df/83193261145.pdf
    • https://s3.amazonaws.com/tadovu/wipajasum.pdf
    • https://s3.amazonaws.com/henghuili-files/14814645504.pdf
    • https://uploads.strikinglycdn.com/files/8214e36a-bd92-4db9-8218-f6639d689f8e/weburerafabegipoxevapexi.pdf
    • https://s3.amazonaws.com/sugaguxagu/arabian_nights_story.pdf
    • https://s3.amazonaws.com/gupuso/bearing_capacity_of_layered_soil.pdf
    • https://uploads.strikinglycdn.com/files/d8550beb-1b7b-478c-a6e5-ab073545bc3e/larofugaxobira.pdf
    • https://uploads.strikinglycdn.com/files/bbc69b39-af7d-4dc9-90fb-bc25f628d258/55662676825.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df18.bin
89c2d47f78c3ed8b292ed6342dd589925081cecc491c230bd571398f65c53dc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF18 5424 bytes
font_01_sfnt_off0000f175.bin
499abbe4265e9bfeebf8398a06267c77c9c236845c1e5ed650b35ddd3c9d800f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 11644 bytes

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