Malicious PDF — malware analysis report

Static analysis result for SHA-256 05faf2b745094c31…

MALICIOUS

PDF

50.4 KB Created: 2020-10-19 05:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 45b031f31f8a377f24f44376fb60ab4d SHA-1: 7afbe820a7d31da0ab279a55fa1e287f40e7b76f SHA-256: 05faf2b745094c317f8109dee0d31e5684490496e4194f38814102097f3a2504
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to lead users to potentially malicious content or phishing sites.

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 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.
  • 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.
  • 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=estatistica+facil+19+edi%25C3%25A7%25C3%25A3o+pdf+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375197/normal_5f8940890180e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378157/normal_5f8ca69c7f9c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367668/normal_5f8bc540a9f78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365627/normal_5f88622a0fa97.pdfIn PDF document text
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/5e82f59a.pdfIn PDF document text
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/9011164.pdfIn PDF document text
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/pedesowodutupupido.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/2215190.pdfIn PDF document text
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/91c26abd5657b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_5f88090c3aed8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368953/normal_5f894679ad0c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371014/normal_5f8ceff9ae4ab.pdfIn PDF document text
    • https://wozuwonasanava.weebly.com/uploads/1/3/1/4/131483955/d872df2681.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/vuvezotuni_fojomejuzagi.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/sivoki_vesejubaduwubu_duvuza_bowuvazapisu.pdfIn PDF document text
    • https://ridolagu.weebly.com/uploads/1/3/0/7/130775195/2491377.pdfIn PDF document text
    • https://wegupufula.weebly.com/uploads/1/3/0/8/130813429/kosusubevogiban.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/05df8d1d-0a0e-4211-a65b-f0e0636bbadc/38173498744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feb44aae-1a10-4da7-b228-693bec2e2e6e/ate_ve_su_2_kitap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d285caf0-ced4-4905-b17a-367898aac293/sifogisofapijabolerolemif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/167f9f67-4982-4f38-a087-f33f96425748/27528072398.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_off00007749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7749 5812 bytes
SHA-256: 3852f2b6cfc90009db5411b585dc91bf244d5ee91e296d7a37d3b1c65d260937
font_01_sfnt_off00008a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A58 16008 bytes
SHA-256: 3cb06716e2277f7edf799e9a2e9ac35545beca32f615d62cd8ce0ecb3f10e8b8