Malicious PDF — malware analysis report

Static analysis result for SHA-256 e040c05b65de2651…

MALICIOUS

PDF

49.2 KB Created: 2020-10-31 07:58:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5741d517dfc512296ea029197098fc83 SHA-1: 1651ed516173e3fbb87b4e454f107a369cc4ae62 SHA-256: e040c05b65de265160e70bb6ee6282cd166d14b5c4ef7db73f8dad84f2d2107c
132 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/123?keyword=showbox+s300+platinum+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4390385/normal_5f96df8d157dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403680/normal_5f9402441c3de.pdfIn PDF document text
    • https://nuvetifozeg.weebly.com/uploads/1/3/4/3/134358797/jalopivutixires_melimeru.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/buwupetijakerawudax.pdfIn PDF document text
    • https://tiwovukixata.weebly.com/uploads/1/3/4/3/134314311/8194803.pdfIn PDF document text
    • https://gewaxuselez.weebly.com/uploads/1/3/4/2/134265722/zaxufuxenixixuzixewe.pdfIn PDF document text
    • https://rimenedefogifu.weebly.com/uploads/1/3/4/4/134466040/dukexonuxufon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5f8896323d603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379841/normal_5f9044ca4d04b.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://cdn.shopify.com/s/files/1/0506/8197/0868/files/vavatadomedunaxuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/0634/0515/files/cooja_simulator_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/reflection_refraction_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/0126/5566/files/fobaxogibiredevikita.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1239/7507/files/organic_cotton_duvet_cover_white.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_off000070af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70AF 5436 bytes
SHA-256: fdf39d063fe7f7d8272ab0bd463a341ab39b21a87b0c72ad14daf7c37bce9004
font_01_sfnt_off000082fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82FD 11576 bytes
SHA-256: b7964f0f8d18a4aa3a8c4a40c2fa32f5915094f9059e8a04d625ead97a64c499
font_02_sfnt_off0000a9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9DA 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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