Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe48dcda5709749…

MALICIOUS

PDF

82.5 KB Created: 2021-01-06 13:47:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 4074937cc95a8ca2eff770b18e0f8c01 SHA-1: 277fbaffee983952e0133a0914a7c44aa89bac65 SHA-256: cbe48dcda570974920228893ba4294ed68471da4bd36212e379af2be0b0ed9e0
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting services and are designed to redirect users to other sites. One of these links, https://cctraff.ru/aws?utm_term=jbt+full+form+eligibility, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm or phishing campaign designed to lead users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/aws?utm_term=jbt+full+form+eligibility In PDF document text
    • https://jubibesu.weebly.com/uploads/1/3/1/3/131379113/wudigutitobagi.pdfIn PDF document text
    • https://rodironamo.weebly.com/uploads/1/3/5/3/135347674/c286cd0f4d9e4d7.pdfIn PDF document text
    • https://fepobiwebefu.weebly.com/uploads/1/3/4/5/134592484/367bc1.pdfIn PDF document text
    • https://lewelekokoje.weebly.com/uploads/1/3/4/3/134333059/390d8154144634d.pdfIn PDF document text
    • https://renenanap.weebly.com/uploads/1/3/4/6/134666424/fitiruwapafinewab.pdfIn PDF document text
    • https://tejojapifofomo.weebly.com/uploads/1/3/4/3/134339563/976049.pdfIn PDF document text
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/5493054.pdfIn PDF document text
    • https://josadezabo.weebly.com/uploads/1/3/4/4/134490641/ee581f944afe5.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/lonamonutisug.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/c322ca87-9f60-424a-ac74-f6126e20fb7e/ragoduraxofufu.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/zezikitosorajosed.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/les_accords_de_piano_gospel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/078836cd-2e03-4887-88f4-52cb32cfa69a/behringer_ep2500_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10e6b4e8-e4d5-414c-badf-40b4c76bdf22/casebook_in_abnormal_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af3fdce0-105f-4ced-97fd-6e2ca2671125/puzulemafase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d6a3896-4380-492a-9dd5-7c384893ff65/greens_fit_for_life.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_off00010734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10734 4928 bytes
SHA-256: 0a6647d86022f88970e11bda35a7b3ca090081502eec7cf210df74fec9f69332
font_01_sfnt_off000117f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F6 10916 bytes
SHA-256: 0e589831825fd43f91bdc6b4dd9f4394b39be826fe0c42ef735749d43ba9f397

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