Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a678ce3efcd2ae…

MALICIOUS

PDF

36.1 KB Created: 2020-10-10 21:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 3a3846c45270ef7d9ce7f5a4bbec814f SHA-1: 21b6d2e292e4e0eb4c24f2dcbe389c69b6b21d90 SHA-256: a4a678ce3efcd2ae9c47a7626cbab244c3508a71ef2f60d6e4c0a0f069763729
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/pify?keyword=imagery+in+to+kill+a+mockingbird In PDF document text
    • https://site-1036935.mozfiles.com/files/1036935/pozubarosilurubamase.pdfIn PDF document text
    • http://files.fredericdurand.com/uploads/1/3/0/7/130740524/ziwetidurijisis.pdfIn PDF document text
    • http://zusumokux.rebelliousrheaboutique.shop/uploads/1/3/0/8/130813528/c57dc0c7e4cee4.pdfIn PDF document text
    • http://files.shuanglongli.com/uploads/1/3/1/8/131856590/4322426.pdfIn PDF document text
    • http://pekiku.rogueartisanfoods.com/uploads/1/3/0/7/130775443/324155.pdfIn PDF document text
    • https://site-1038618.mozfiles.com/files/1038618/47139319900.pdfIn PDF document text
    • https://site-1036698.mozfiles.com/files/1036698/paraviduwosi.pdfIn PDF document text
    • https://site-1039900.mozfiles.com/files/1039900/xeduputetomimesifi.pdfIn PDF document text
    • https://site-1044064.mozfiles.com/files/1044064/vibivafotesojevigexa.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/1/0430/9788/2773/files/chem_105_lab_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1108/8799/files/fezuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6520/7712/files/70584415788.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2636/9690/files/trailfinder_all_terrain_275_65r18.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2053/5968/files/study_guide_econometrics_vu.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_off000050d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50D0 5324 bytes
SHA-256: f3965f40dada702dfb738847f564d42bcb822526dbe9c64d715edb9c8076b402
font_01_sfnt_off000062ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62CE 9652 bytes
SHA-256: 02e06c66c1e216f07f6d4073a71bbc10258d89c6b27f004f8869ce9ab7ed5514