Malicious PDF — malware analysis report

Static analysis result for SHA-256 e729853677634dc7…

MALICIOUS

PDF

59.0 KB Created: 2020-09-30 16:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 89be777d78d21386d8efde34b59bcaa2 SHA-1: e08b67233cd4a23aff6bcaee3119eb792aae79aa SHA-256: e729853677634dc7c2efe01e60ea7eeb57b4cb1fe8004335a9a9e04776a67269
184 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded URLs pointing to external PDF documents hosted on various domains. The heuristic firings indicate that this is a malicious redirector and a link farm, likely used for SEO manipulation or to distribute further malicious content. The embedded URL `https://gettraff.ru/strik?keyword=descriptive+correlational+research+method+pdf` is flagged as a known malicious redirector.

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://gettraff.ru/strik?keyword=descriptive+correlational+research+method+pdf In PDF document text
    • http://files.piommiami.org/uploads/1/3/0/7/130740375/lareleris_daperubuwaxeji_fimixajitiv_waninekadirepu.pdfIn PDF document text
    • http://vaxajun.trulymedium.com/uploads/1/3/2/3/132302921/7325384.pdfIn PDF document text
    • http://files.rentatent-sw.co.uk/uploads/1/3/1/8/131856039/wutajagibewu-zaxago-fafukozijive.pdfIn PDF document text
    • https://site-1036628.mozfiles.com/files/1036628/25385373841.pdfIn PDF document text
    • https://site-1038608.mozfiles.com/files/1038608/65254973559.pdfIn PDF document text
    • https://site-1036814.mozfiles.com/files/1036814/45365771863.pdfIn PDF document text
    • https://site-1037000.mozfiles.com/files/1037000/9544188210.pdfIn PDF document text
    • https://site-1036852.mozfiles.com/files/1036852/73890310798.pdfIn PDF document text
    • https://site-1036754.mozfiles.com/files/1036754/rudiroxum.pdfIn PDF document text
    • http://files.youthresponseguidecwr.org/uploads/1/3/1/3/131384424/a266b776f8a7c.pdfIn PDF document text
    • http://files.karikant.com/uploads/1/3/1/3/131397955/6534691.pdfIn PDF document text
    • http://fagege.lavingtonurc.org/uploads/1/3/1/3/131398134/bagik_bamikuf_kogerogi.pdfIn PDF document text
    • http://files.thejulianfarmhouse.com/uploads/1/3/2/7/132712120/8275596.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000a91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA91D 5452 bytes
SHA-256: a1a4c9bef1dff9fe76a662b5ce66e4ddb3a78a10e9fab33bb4159f5adf279ac0
font_01_sfnt_off0000bb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8A 10312 bytes
SHA-256: 9d54b692bd27b17ba11a657078464ea67fddb308175a188e0d291e8b23680bdc

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