Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9932ed71712ea2…

MALICIOUS

PDF

59.5 KB Created: 2020-10-09 21:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 9311fb4d4c466fbdfad58827e84328c6 SHA-1: b1feffdc5a215b3f7f5a40d8ec0347f9236b5b05 SHA-256: 3b9932ed71712ea2b83a8db19ab4b982e00a119ace5d135f69f7c9619f9a5ff5
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/strik?keyword=bokanovsky+process+allusion In PDF document text
    • http://files.writenowforwellbeing.co.uk/uploads/1/3/1/4/131453081/bovika.pdfIn PDF document text
    • http://files.marriedtotheauthor.com/uploads/1/3/1/0/131071167/2521d841f9.pdfIn PDF document text
    • http://files.sowsearpoetry.org/uploads/1/3/0/7/130775518/2116926.pdfIn PDF document text
    • http://mutod.seedsofhope12.com/uploads/1/3/2/3/132303064/70dccc33.pdfIn PDF document text
    • http://files.everythingcapturedphotographyart.com/uploads/1/3/1/8/131871477/benujigojele_xakukiroped_ruvejedipemifo.pdfIn PDF document text
    • https://site-1039915.mozfiles.com/files/1039915/84568049573.pdfIn PDF document text
    • https://site-1040663.mozfiles.com/files/1040663/10007810457.pdfIn PDF document text
    • https://site-1042672.mozfiles.com/files/1042672/zijusibexadozuxe.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/1/0476/5171/7286/files/13440977944.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8127/7345/files/nulatap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/9364/8294/files/hpi_e_savage_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4233/2057/files/bill_nye_the_science_guy_digestion_worksheet_answers.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_off0000ac91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC91 5200 bytes
SHA-256: fecba1e9757e145a675444ef9ac4b63cc67b1702d1f4c9c45cf2c79e14e0b26e
font_01_sfnt_off0000be65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE65 10192 bytes
SHA-256: 5fc0db1332896b5058012a8ef487051e03bf998558a6c1badb1a6b30d94886bf