Malicious PDF — malware analysis report

Static analysis result for SHA-256 4734a6c3ce65d194…

MALICIOUS

PDF

40.8 KB Created: 2020-10-07 23:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: e00776a2e2f9e586500f3c6c722cf6b9 SHA-1: 4db2a0dba48f04d0c451d4f8c63cdf811eef70a0 SHA-256: 4734a6c3ce65d194c7b7d9dba2e4ea6d87bbecc59e8a931afd0a9f5c13c7f2b8
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://ttraff.club/pify?keyword=school+speak+login In PDF document text
    • http://rifagi.surfaceimports.com/uploads/1/3/0/7/130738731/nezamiga.pdfIn PDF document text
    • http://files.deannalorenphotography.com/uploads/1/3/0/8/130814298/vijesomep.pdfIn PDF document text
    • http://files.caseeng.com/uploads/1/3/2/7/132740204/6916962.pdfIn PDF document text
    • http://ludorawo.eagletakeaway.com/uploads/1/3/1/6/131636725/loloma.pdfIn PDF document text
    • http://files.tlcwoodcraftsllc.com/uploads/1/3/1/4/131438758/19981.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/1/0496/1357/0199/files/healthcare_business_analyst_salary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8497/2183/files/hp_pavilion_22cwa_best_buy.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/the_big_book_bunch.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7078/2614/files/nj_working_papers_rules.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1447/8760/files/40117954753.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4868/1120/files/america_claims_an_empire_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/4139/0492/files/hark_the_herald_angels_sing_piano_chords_g.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7140/6241/files/52391994063.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/1489/3980/files/50_sombras_mas_oscuras_mega.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_off00006118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6118 5268 bytes
SHA-256: 0faa5e1c1ae2f75c9e82fc5f08e8bf50a43e90473ca329be98a9da002c8ae582
font_01_sfnt_off00007305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7305 10324 bytes
SHA-256: a993dfd32dada3e653a999e36a89ab973ca46f2935ed2c2a6de3bb0b6f215a16

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