Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20fc7d7217023d9…

MALICIOUS

PDF

54.6 KB Created: 2020-10-29 15:13:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 25a1614e90a624ac594786d2ec37d0fa SHA-1: b4172d230d3ecd933a84a271b2d7972a41a735d3 SHA-256: b20fc7d7217023d9bee3985fe9b26ca62c948da5253ca00e85db10e282bcff12
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=maxxis+mud+tires+review In PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/6519406.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/mowedepesen.pdfIn PDF document text
    • https://nefalitarula.weebly.com/uploads/1/3/4/3/134308949/5a190bc975b3537.pdfIn PDF document text
    • https://xitonodulamet.weebly.com/uploads/1/3/4/3/134307836/feroxa.pdfIn PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/rojubobirufo.pdfIn PDF document text
    • https://pasutexovemas.weebly.com/uploads/1/3/0/9/130969198/kozepasagene.pdfIn PDF document text
    • https://fevapeju.weebly.com/uploads/1/3/4/4/134468187/kinipi.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00009741.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00009741.bin)
    • https://cdn.shopify.com/s/files/1/0499/8112/8897/files/34582449249.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/chord_progression_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1905/1425/files/ecografia_renal_normal.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/deep_dish_wheels_for_sale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6099/7529/files/catalogo_de_cores_suvinil.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/29019023855.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1396/3935/files/nosferatu_vampire_the_masquerade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4171/6906/files/21491458104.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/din_en_iso_9227_cass.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/9731/9333/files/38428012473.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 extracted file (font_00_sfnt_off00009741.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9741 5164 bytes
SHA-256: 9d1d0a7517a7856f0b18319daed1dbd6187b3b6f0681fc912a975385684dba01
font_01_sfnt_off0000a8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8D3 10712 bytes
SHA-256: cd09fcff21c1db0c9040cff71e1612194c5bd7e45601a83d3a9b574739a24355