Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c987f506a3382d…

MALICIOUS

PDF

37.7 KB Created: 2020-10-09 09:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 7f591bfbf0986a7ee82d9b3c706d6229 SHA-1: e99103515ec02008d2aeb8f8991a5b51c53b1c76 SHA-256: 34c987f506a3382d2e4b938ad3574ce018facc34bae5611eb0a1b00d4cd44707
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=download+speaker+booster+plus+apk In PDF document text
    • https://site-1036995.mozfiles.com/files/1036995/30500971630.pdfIn PDF document text
    • https://site-1044236.mozfiles.com/files/1044236/85180974363.pdfIn PDF document text
    • https://site-1038717.mozfiles.com/files/1038717/rukozavizorigitudirebule.pdfIn PDF document text
    • http://gunalo.stmarkski.com/uploads/1/3/1/4/131437069/9783580.pdfIn PDF document text
    • http://files.primarycoffeeroasters.com/uploads/1/3/0/7/130738883/fiputopogo-dewalakukagijap-mubedodu-naronanefolade.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/1/0470/6140/1768/files/86578999477.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2286/6837/files/sample_parental_consent_letter_for_passport_application.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1751/0818/files/20806633520.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9304/8992/files/perfect_progressive_verb_tense_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9769/4114/files/rabulezuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9503/8888/files/gogibikikajatanew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2308/4951/files/44806608861.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_off0000552b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x552B 5248 bytes
SHA-256: 11910cae0d7c40940ccb000f66890d5324f6ae5fadf876e7bf8d52d67456f095
font_01_sfnt_off00006728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6728 10196 bytes
SHA-256: ce86cebde126cf1edef5700f109807797ba57b952d1a391bdac9043d09348e17