Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d25ff466c6c4e7…

MALICIOUS

PDF

51.8 KB Created: 2020-10-29 06:20:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ba918f2e275ff9734fa2eafeb664804d SHA-1: 85be7ebcdb9fc025d035d15d62530f9a749063c7 SHA-256: 57d25ff466c6c4e76285c2be2cfe416579afb7710f2179ba1cba0bdbd8211544
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 link farm and a redirector to malicious infrastructure, disguised with a lure related to 'Kali linux books pdf'. The embedded URL https://ggtraff.ru/strik?keyword=kali+linux+books+pdf is a critical finding, indicating a likely phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and link redirection suggest an attempt to lead the user to a malicious site, potentially for further exploitation.

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://ggtraff.ru/strik?keyword=kali+linux+books+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4404966/normal_5f9385e6d7bbb.pdfIn PDF document text
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/gerujopap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403276/normal_5f964e293040d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385198/normal_5f95edf9e4dbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377642/normal_5f8c44f055ca8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418557/normal_5f99cce21d0f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392199/normal_5f9643ed06aab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415962/normal_5f99faf234fad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368489/normal_5f8e16ac43787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382789/normal_5f8be4b298cf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409102/normal_5f938ec3963b6.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/telopubujixamivope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384150/normal_5f8f16683648d.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://uploads.strikinglycdn.com/files/791a10cd-3d56-4057-ad6b-5691fa260353/10837696140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f23cd9f6-85ab-4cf5-8c0c-b8cc7d2bbc70/livujuvinirijakirasij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/317dec67-dc8d-441d-9ef7-e7f96f795e50/sijuwixefabigajutifabowuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b887a72b-2e5e-4ab3-b93f-d2ec67682c57/wifoluwagodibireb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08f8bfca-7ab3-4f41-90e6-bcc4dcf4cf2c/dr_seuss_the_cat_in_the_hat_movie_free_download.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_off000080e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80E4 4864 bytes
SHA-256: 1ad032885efc9b9b5e44e3091b03a33b8b2100589786101fdbfdd02b422ccacb
font_01_sfnt_off00009166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9166 10012 bytes
SHA-256: 27e0340a91253863b7b234fd19a8f613721bde32b273f6bf64cb1a92cd8e17d6
font_02_sfnt_off0000b3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CD 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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