Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b131dbbe2e6d70d…

MALICIOUS

PDF

43.6 KB Created: 2020-10-31 03:20:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 63c318cbe8063e1c07c65fdb303ec685 SHA-1: 26539d0a30f782208fb5e8bcce2bf43c4cee4b6c SHA-256: 9b131dbbe2e6d70d2a5e9d2163f721131fceff84a6069fd28de3370f247d182d
202 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains embedded links, one of which points to a known malicious redirector. The document body, though partially obfuscated, contains text related to university tuition and board, suggesting a lure to trick the user into clicking the malicious link. The ML classifier strongly indicates maliciousness, and the presence of a link farm further supports a malicious intent to redirect users.

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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/aws?keyword=university+of+hawaii+at+manoa+tuition+room+and+board In PDF document text
    • https://zekuwatifakaxi.weebly.com/uploads/1/3/2/8/132815855/4640873.pdfIn PDF document text
    • https://xonuvalax.weebly.com/uploads/1/3/1/4/131437330/sirikafebigaxokapexo.pdfIn PDF document text
    • https://karezolakep.weebly.com/uploads/1/3/1/3/131398125/vonakikidigis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/5102/2001/files/bigirovezugulipuveza.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/fund_accounting_journal_entries.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23ee3f76-9b0a-4d98-bb94-35e9951ce26f/mcgraw_hill_connect_answers_chemistry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f08287f-4eee-455e-8ce3-5b414acd3967/85553948096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/523abb1f-d8a1-4efe-9889-fafa8d41a15c/vupojazeporiwuxosupin.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/jersey_shore_family_vacation_season_4_episode_26.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bbe702e-39b2-4798-b7a8-ca8e2c41de34/rogosavilasarobapugebap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a32df95-facb-4d00-ad6f-53fe23487f5b/bedojedowovusobenefoleto.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_off00006963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6963 5500 bytes
SHA-256: f8b77457d755b657c8cf6677e3806803ef22efdd47686a8cced15cfa2a5fd5ba
font_01_sfnt_off00007c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C0A 10916 bytes
SHA-256: 7982d3c13e5c1de2794219ceba92fa9bc676ccb71c054759fc04118a3ccf5bca

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