Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f404076fb40293…

MALICIOUS

PDF

43.7 KB Created: 2020-11-01 18:09:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cc6b98f7313c438831785064d235d03d SHA-1: edff506dfa4b5aa2b9709b12ce2d8028f59e8660 SHA-256: 55f404076fb40293b3ce76c09d6d548924fec91b1d9afa9f2c114fad04e62429
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded URLs, many of which point to link farms or redirectors. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL leads to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs suggest an attempt to manipulate search engine results or redirect users to malicious content, likely for phishing or malware distribution.

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 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.
  • 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?keyword=books+by+donald+crews In PDF document text
    • https://cdn-cms.f-static.net/uploads/4420034/normal_5f9625801a0b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368740/normal_5f931a93555e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391611/normal_5f926a705602e.pdfIn PDF document text
    • https://nadazilagola.weebly.com/uploads/1/3/4/3/134314388/de10d4429b7286c.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/7ac1c46e726.pdfIn PDF document text
    • https://biwugina.weebly.com/uploads/1/3/1/1/131163984/7037580.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366654/normal_5f8734a937abd.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/pomegufeju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366346/normal_5f877689143b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378613/normal_5f9463967aa98.pdfIn PDF document text
    • https://mututekabifu.weebly.com/uploads/1/3/4/4/134466573/kateja-zedimepibif-julek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CDE 5040 bytes
SHA-256: e9b6e3e37240b949ddf56f29411b5b926f700bd2f76dd6609fbbec7bfb61eedb
font_01_sfnt_off00006e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E15 11152 bytes
SHA-256: f7eb84b4e3f90520a20259a7844e943ebe8f970229adc70bb8270b680dd9abd0
font_02_sfnt_off00009444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9444 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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