Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27082d4d1384ee1…

MALICIOUS

PDF

39.3 KB Created: 2020-11-02 07:07:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 14863782fc14804e19924b06c3053a1c SHA-1: 7da4d2b8a2af0fb1085058e0965fa545468d5001 SHA-256: a27082d4d1384ee1035e46531c5bc6530b63eb448ead84646bb576ceeb1b3280
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://gettraff.ru/aws?keyword=advanced+cause+and+effect+esl+worksheet+pdf In PDF document text
    • https://zuvubexusemeto.weebly.com/uploads/1/3/4/3/134373725/afda2.pdfIn PDF document text
    • https://tusemebi.weebly.com/uploads/1/3/4/3/134316443/3498508.pdfIn PDF document text
    • https://guzebiba.weebly.com/uploads/1/3/4/3/134368687/cf0ab48.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/1/0495/9682/5764/files/smithing_guide_osrs_1-99.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/73306380185.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b679f677-ab44-4fb5-b25b-46dbd9ee6968/19073122124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5836b6c8-166a-4883-96bc-ca8fafd2e194/36245129334.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/lg_direct_drive_motor_warranty.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7707/4588/files/asvab_book_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbabeffd-03e8-40d3-a70a-31f5d43cc184/98049701448.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_off00005a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A91 5448 bytes
SHA-256: 955200ad725b37534a0c9314b9f16ff95bd0d70463802eccd8e5456f3a07e761
font_01_sfnt_off00006d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D31 10412 bytes
SHA-256: 1eba16874d7e954b6983e2380f0c9e9ff742d150c419188eb8d54dcff597ed2b