Malicious PDF — malware analysis report

Static analysis result for SHA-256 171b748d4e4b3e1a…

MALICIOUS

PDF

51.5 KB Created: 2020-10-02 14:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 15fee5a6ea317050e72e21d0646533be SHA-1: 7dba52e3fdef4ef11dea10af70618f16e66736c2 SHA-256: 171b748d4e4b3e1aed9563f4ec22b81848d8405a1cea78164dc5b0f4502a60d6
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=acog+204+fetal+growth+restriction In PDF document text
    • http://files.ddayhistorian.com/uploads/1/3/0/8/130813528/8237635.pdfIn PDF document text
    • https://site-1037276.mozfiles.com/files/1037276/95371492192.pdfIn PDF document text
    • https://site-1039503.mozfiles.com/files/1039503/13238078540.pdfIn PDF document text
    • https://site-1040359.mozfiles.com/files/1040359/60650452648.pdfIn PDF document text
    • https://site-1036823.mozfiles.com/files/1036823/kebazeni.pdfIn PDF document text
    • https://site-1039375.mozfiles.com/files/1039375/dikerunodugakufot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9376/2975/files/27136229508.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8357/0083/files/ones_tens_hundreds.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0728/7189/files/zigijodajajiduv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1798/1082/files/32874660378.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/3468/8927/files/domain_class_model.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8488/7702/files/korikopema.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D25 9680 bytes
SHA-256: d02ddb231df0711376a2cbc99b310727f906cb380ea15ed82f2f6dabdf0182c1
font_01_sfnt_off00007d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D14 5376 bytes
SHA-256: ef93b3c9bbac989b61ecb7ffd6cb898f6588bef01135686aa0cd99c9d486dbaf
font_02_sfnt_off00008f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F5F 10376 bytes
SHA-256: 5a17939388053c1d138b0977b69a2efb6d8ae1196b2c746bef6769338d3c2633
font_03_sfnt_off0000b2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D5 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378