Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a041dd6688937af…

MALICIOUS

PDF

41.9 KB Created: 2020-10-01 03:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 156058a2ce9370b68852d791d7458002 SHA-1: e7ff5e1850cca8da16373d7ac98809209a415f25 SHA-256: 4a041dd6688937affd3eb14830300deacf3d9ee670cdfe7ab636399cfdbd83f4
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=tokoh+pendidikan+islam+di+indonesia+pdf In PDF document text
    • https://site-1039725.mozfiles.com/files/1039725/welebizawedolukarejunarig.pdfIn PDF document text
    • https://site-1037266.mozfiles.com/files/1037266/jefinunidejukefoguz.pdfIn PDF document text
    • https://site-1036921.mozfiles.com/files/1036921/jikezijilixujofasujuf.pdfIn PDF document text
    • https://site-1036796.mozfiles.com/files/1036796/bogotifaxolekapidukewuke.pdfIn PDF document text
    • https://site-1036980.mozfiles.com/files/1036980/dezewusumumis.pdfIn PDF document text
    • https://site-1038503.mozfiles.com/files/1038503/74850622671.pdfIn PDF document text
    • https://site-1036829.mozfiles.com/files/1036829/dalamalebexejuzisov.pdfIn PDF document text
    • https://site-1037019.mozfiles.com/files/1037019/8341363809.pdfIn PDF document text
    • http://files.colleenshaunawaters.com/uploads/1/3/0/7/130739595/49f281c2.pdfIn PDF document text
    • http://files.hanleyvoices.org/uploads/1/3/1/3/131398334/9144211.pdfIn PDF document text
    • http://xixil.toowoombakoalarescue.org/uploads/1/3/2/6/132682787/1024110.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/1/0429/0389/6230/files/95640629622.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7091/4717/files/41044430067.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9113/1557/files/26892543660.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7514/1794/files/69965530460.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2846/1206/files/wozegedubolamof.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_off000066bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66BB 5196 bytes
SHA-256: e121c81c906feb74c6d696003af235fab0793dc6f22453a88bacf67bcdf287b7
font_01_sfnt_off0000784a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x784A 10096 bytes
SHA-256: adbac40836f98b14edd111ff473265c401e186df3a2201aaea0047cf9ce1e960