Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b677ff28049f451…

MALICIOUS

PDF

38.7 KB Created: 2020-11-05 08:40:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 998d3458fc85512456ec1a54613a9816 SHA-1: bc3ef8aa4442dfc0d9ab5ee9cba1c2c02639a273 SHA-256: 5b677ff28049f451a88f233d347d7550c1381cfe05202e92f740e10831361a2c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://gettraff.ru/strik?keyword=hp+easy+scan+app+store In PDF document text
    • https://kiroteveve.weebly.com/uploads/1/3/4/3/134378898/zupogopiwabebuj.pdfIn PDF document text
    • https://sujajikozodes.weebly.com/uploads/1/3/1/3/131384638/944560.pdfIn PDF document text
    • https://xazapadikud.weebly.com/uploads/1/3/1/8/131871762/metojolito.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_5f8bc820dbc81.pdfIn PDF document text
    • https://rizebilawi.weebly.com/uploads/1/3/0/8/130814716/muwunenitodilipuz.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/zezojenada.pdfIn PDF document text
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/nafunoruwoj.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/dorin_xujigoxuzut_nagegivemewomod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391611/normal_5f9334adeb650.pdfIn PDF document text
    • https://vilemanunopabom.weebly.com/uploads/1/3/4/3/134317174/xolafajofokejawud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xabalaru/easy_piano_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/64312187173.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/ddo_epic_tr_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/bright_futures_scholarship.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_off00005b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B1F 4960 bytes
SHA-256: ccea24aaef1da3db4abec35cc916ce37521b5e4e4a7843b7ea74a936b6b83dde
font_01_sfnt_off00006c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C13 9940 bytes
SHA-256: ed2385b3d259a59c008dcb28c5b4909920cfcca74a4c5806a0ec1e7fe94693be