Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fa6ecd6292adea…

MALICIOUS

PDF

83.0 KB Created: 2020-12-28 04:51:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9fc48a8e256bfd1b322f0e8d4ec5132f SHA-1: 57569b3dd6d9c3e551b50dbd3dfcf87c759e56e2 SHA-256: a3fa6ecd6292adead4fbbf7cb3ae1d84bafbbe6a4cc147edc59451f173357020
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm, directing users to various external PDF files. One of these links, 'https://cctraff.ru/aws?utm_term=catholic+answers+king+james+bible', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely to lead users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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?utm_term=catholic+answers+king+james+bible In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418777/normal_5fc315c305cd9.pdfIn PDF document text
    • https://cdn.sqhk.co/sijiposago/gg8Cif9/75757708103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370740/normal_5f8d3ba4d0d13.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/fijjhhg/free_download_motogp_games_for_pc_full_version.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/EwjcijA/55179791116.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411498/normal_5fcdc8ae63a03.pdfIn PDF document text
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/jopiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479710/normal_5fc48f11e12a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465545/normal_5fcc82f4dc3a2.pdfIn PDF document text
    • https://cdn.sqhk.co/lerotakisisa/8jegfhi/gefavokuzoleli.pdfIn PDF document text
    • https://mopotepawo.weebly.com/uploads/1/3/0/7/130738720/divad_vonajujerane.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/ritoma/baxirubuzokeravezazezatip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba17347d-1d07-48bd-a26f-0081a2026f70/sim_freeplay_guide.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_off0001074d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074D 5488 bytes
SHA-256: 590527a636e1afdb720aa9e45d75e5430d6a04992bfa1d051da35d056a4c4025
font_01_sfnt_off000119e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E1 10800 bytes
SHA-256: e6dc54e22039e4ecc05282263a9d0dfb8f8258a2ab9931488c547415220e72f4

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