Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2fe8f9be1f3858…

MALICIOUS

PDF

55.1 KB Created: 2020-11-08 13:46:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c0dff8bf8e483f476aa1821d242dc16f SHA-1: ba7a74ff6572d0391ce7e9ea1bbb0e6175d980e4 SHA-256: 9b2fe8f9be1f3858e4461cd4cc8b834c899d67e031d1619547a62f363ea69e53
126 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified as a link farm. The primary URL, 'https://trafffi.ru/aws?keyword=step+by+step+mixing+pdf', suggests a potential SEO manipulation or content distribution scheme. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent behind the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/aws?keyword=step+by+step+mixing+pdf PDF link annotation
    • https://woxomeze.weebly.com/uploads/1/3/4/4/134498023/sumepam.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/vusujopixolufuw_vizer_lajiguwuvijuku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_5f8d391b0968a.pdfIn PDF document text
    • https://jexetapi.weebly.com/uploads/1/3/4/3/134345775/kuzinix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425511/normal_5f99da0ada452.pdfIn PDF document text
    • https://xoxebugifujame.weebly.com/uploads/1/3/4/4/134478015/jeruxolowilud-wisanexolis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5f87212fbdfd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421050/normal_5f9e81824a3e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sisiviweze.files.wordpress.com/2020/11/50939477702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c3a6cc1-5421-428e-944c-9d3f350fba6b/89673509282.pdfIn PDF document text
    • https://fewenepigat.files.wordpress.com/2020/11/gelejawetegemin.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_off000098b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98B8 5436 bytes
SHA-256: 6f5c7aee6cf295f664c84410991b7fcbdd878cef9631153bc54ab1a5c306b9d6
font_01_sfnt_off0000ab34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB34 10928 bytes
SHA-256: 37b391d4b00c6b13eac086e34969a8ddb9dedd6b0dc1c829143ec3d78981de17

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