Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c026cc4f7b9c7a6…

MALICIOUS

PDF

70.5 KB Created: 2020-07-08 11:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: 644424d8a760fe8f4952e56c7a136812 SHA-1: a613bf3412a87440d206e8ad0d002820743e127b SHA-256: 9c026cc4f7b9c7a65eec0c6867ade535bdee3ef5a76db857b8fdf8fabb0a93a5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically `https://ttraff.cc/wb?keyword=memorex%20projection%20clock%20radio%20manual`. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous links to other PDF files hosted on various domains. The document body, though heavily obfuscated, also contains the same redirector URL. These elements strongly suggest a phishing or malware distribution attempt.

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://ttraff.cc/wb?keyword=memorex%20projection%20clock%20radio%20manual In PDF document text
    • http://files.nctreasurechest.org/uploads/1/3/1/4/131453316/7632114.pdfIn PDF document text
    • http://files.broadbandaccess.org/uploads/1/3/2/6/132695572/2298a.pdfIn PDF document text
    • http://files.jaeeunpilsbury.com/uploads/1/3/1/8/131857818/9280850.pdfIn PDF document text
    • http://files.lifewisegifts.com/uploads/1/3/0/8/130874128/6ab8d3.pdfIn PDF document text
    • http://files.ansomproductions.com/uploads/1/3/1/4/131454850/7100536.pdfIn PDF document text
    • http://files.howtobeaweddingcoordinator.com/uploads/1/3/0/7/130776514/monamimo.pdfIn PDF document text
    • http://files.whiteeagleworcester.com/uploads/1/3/1/4/131409508/desefobogaxefowizu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://vugerudima.files.wordpress.com/2020/06/tigaganezexanewefe.pdfIn PDF document text
    • https://vonubese.files.wordpress.com/2020/06/80937803659.pdfIn PDF document text
    • https://ronoretexupo.files.wordpress.com/2020/07/50293187846.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC366 5136 bytes
SHA-256: b5f6cc2b773946cadf86fb160877a1ce519f435071128c3839a6a10f8dc539d4
font_01_sfnt_off0000d4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C8 2048 bytes
SHA-256: ac563f1180543c9f4d9b102108afa0e0941b2fd4f199aa08af3cddd05ca1801a
font_02_sfnt_off0000dda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA4 15652 bytes
SHA-256: 50bcf872ac69aeee65468f58fdf3ab4b6b2b5051e12b6e13545a3858a793ea09