Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1375ec708bb3357…

MALICIOUS

PDF

43.4 KB Created: 2020-11-07 21:55:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: c55cbe185e1d973e7030daa0a512fd14 SHA-1: b3484f96f31474357ecedfd2f62256f94015f3ab SHA-256: f1375ec708bb33578943f534922492cb36e36dd5aeb64c02bba441c28c68056f
194 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=rwby+map+of+atlas In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370097/normal_5f92584cb97cc.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/zetare/automate_the_boring_stuff_with_python_3.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/basic_knowledge_of_civil_engineering_for_interview.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/baldis_basics_unblocked_66.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/objective_personal_pronouns_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/suzuki_book_4_piano_accompaniment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd5f9f89-d0ff-4444-8082-4ecd338674ab/cauchy_kovalevskaya_theorem.pdfIn PDF document text
    • https://pidenus.files.wordpress.com/2020/11/dfv_228_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/4804267693.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/types_of_weathering_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00402e79-7609-4a9b-a82e-bbae69be049a/cuentos_de_fantasia_largos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20294f71-6af4-4579-8614-17a646349a4d/80673881108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c2a92c8-9ffa-4ef4-83d9-a983037a3e70/xasap.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_off00006a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A71 5292 bytes
SHA-256: f9a677b30480ec9ee831c88810e98c3652217d66be5c45cb4d48da2dc0530666
font_01_sfnt_off00007c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C7A 10392 bytes
SHA-256: 5c516eee206197a9f15f3398001033e6b291b668b63f0541634b3bd308db49b8