Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0b178099b93d8a…

MALICIOUS

PDF

37.9 KB Created: 2020-10-05 04:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 937592387dc6e4bf834053b043b1dcd1 SHA-1: eb043300ec5d8174bbe0722bdfedcf11ec3fe892 SHA-256: 4d0b178099b93d8a6a18313c1dfcb414232ef7e0a9c330038afe645d3745a9ce
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=partituras+en+blanco In PDF document text
    • https://site-1040443.mozfiles.com/files/1040443/9508055563.pdfIn PDF document text
    • https://site-1038432.mozfiles.com/files/1038432/58284219680.pdfIn PDF document text
    • https://site-1037010.mozfiles.com/files/1037010/86974380120.pdfIn PDF document text
    • http://gozazome.luvsheascloset.com/uploads/1/3/2/6/132695213/duwutirejepun.pdfIn PDF document text
    • http://files.poseidonwater.com/uploads/1/3/2/6/132681229/metumo.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/1/0476/3402/2566/files/41874302722.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3669/6995/files/61390513663.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9910/9016/files/clockwork_angel_read_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8618/3577/files/2003_arctic_cat_300_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5413/5976/files/11_20_as_a_decimal_betting.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5258/8437/files/86050735514.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7424/3748/files/hidden_city_locations.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0468/0358/3125/files/5072142679.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3605/2136/files/types_of_sculpture_in_india.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_off00005378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5378 4936 bytes
SHA-256: 54d2a9f327e0b8ac668a9f2a2d7adb98f5a15748ed29ebbfd0dc04a5a2dec41b
font_01_sfnt_off00006449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6449 11580 bytes
SHA-256: f6f7c7df3d7199744049fd8f14c0428cf249defa6727936a71b2a1935d791916