Malicious PDF — malware analysis report

Static analysis result for SHA-256 9710b0a5a559c389…

MALICIOUS

PDF

41.8 KB Created: 2020-10-03 05:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 4b791c10b4289a519da5a0697a12b717 SHA-1: 877888484ce3aa750136ccd8c1ff45b54af72f35 SHA-256: 9710b0a5a559c38901526ae8b8727847b767800f6550da1790efc1d1642fe6b3
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=factoring+quadratic+equations+pdf+worksheet In PDF document text
    • http://files.manisteecd2.org/uploads/1/3/0/7/130776734/c95ed7479818a32.pdfIn PDF document text
    • http://files.crescentmoonconjure.com/uploads/1/3/0/7/130775557/sibosidifiro.pdfIn PDF document text
    • http://files.jessicamauderer.com/uploads/1/3/0/9/130969465/ea15a17.pdfIn PDF document text
    • http://files.happyrockpets.com/uploads/1/3/1/6/131606146/1086053.pdfIn PDF document text
    • http://files.mskbarbour.com/uploads/1/3/1/3/131379296/mizoninosuxasuveg.pdfIn PDF document text
    • https://site-1037202.mozfiles.com/files/1037202/digukegitoxusig.pdfIn PDF document text
    • https://site-1037069.mozfiles.com/files/1037069/fikogi.pdfIn PDF document text
    • https://site-1040503.mozfiles.com/files/1040503/69320291629.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/1/0434/1999/2222/files/the_rebel_osho.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4521/9232/files/star_wars_battlefront_2_legacy_mod_how_to_install.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8799/4792/files/92194174510.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/2002/7557/files/sosevagenunasimiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/3879/7724/files/56010145202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1f643e9-1f75-437e-a481-c9d56c47eb93/1696447771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a896b3cc-6e0b-40cd-8aad-78741a53ef8a/43790346791.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_off00006570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6570 5624 bytes
SHA-256: e08545b7fc544f82daf881e6e3bbd4dcf4639d23e9e0bac88162eac2a66901bf
font_01_sfnt_off00007896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7896 9884 bytes
SHA-256: ad1c494a888ec083ba9b08f6d899b439ffa7fdb93418961028e67e8559cb9d92

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