Malicious PDF — malware analysis report

Static analysis result for SHA-256 9224fb94911f4d16…

MALICIOUS

PDF

41.0 KB Created: 2020-10-02 05:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 1bfbc5151307412c3f397f776f80cc06 SHA-1: bbff0adfd628c436e0ec0746f15cd1cc3803a7b9 SHA-256: 9224fb94911f4d162533d504ecee867665f72bdac356081772f01bf7c59a0ce5
192 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ggtraff.ru/strik?keyword=vitalsource+bookshelf+ebook+to+pdf In PDF document text
    • https://site-1036799.mozfiles.com/files/1036799/97366063584.pdfIn PDF document text
    • https://site-1037178.mozfiles.com/files/1037178/tedis.pdfIn PDF document text
    • https://site-1039275.mozfiles.com/files/1039275/83785751185.pdfIn PDF document text
    • https://site-1037022.mozfiles.com/files/1037022/wexadodolit.pdfIn PDF document text
    • https://site-1039342.mozfiles.com/files/1039342/5345264055.pdfIn PDF document text
    • https://site-1039305.mozfiles.com/files/1039305/36300295838.pdfIn PDF document text
    • https://site-1036868.mozfiles.com/files/1036868/75771517728.pdfIn PDF document text
    • https://site-1038998.mozfiles.com/files/1038998/49102025593.pdfIn PDF document text
    • https://site-1037082.mozfiles.com/files/1037082/zudun.pdfIn PDF document text
    • https://site-1038529.mozfiles.com/files/1038529/35708993026.pdfIn PDF document text
    • http://files.sextherapyportland.com/uploads/1/3/2/6/132681450/ebfe01.pdfIn PDF document text
    • http://files.ghs1978.com/uploads/1/3/1/4/131406807/tasunibus_tusuroxusulavo_nupabopoxan.pdfIn PDF document text
    • http://files.shanghaisimultaneousinterpretationequipment.com/uploads/1/3/1/4/131453645/kurudurenu.pdfIn PDF document text
    • http://files.commercialroofingofdallas.com/uploads/1/3/0/7/130775033/wovugazupo_nopiru_suvixubav_ridadakebeto.pdfIn PDF document text
    • http://kilipo.parisaforoutan.net/uploads/1/3/1/4/131409090/927af57c23bd3f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00006125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6125 5412 bytes
SHA-256: 0528d44b57cbf5a0ad437d07e30fa51c2fd15cd08e4cd534938321adf4dc90b2
font_01_sfnt_off00007382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7382 10532 bytes
SHA-256: 75b00bc423e66723f8b4dc086664da929a371a49a256e65070cff6a2edb93b8f

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