Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2671e0adaf6c04…

MALICIOUS

PDF

51.5 KB Created: 2020-10-25 18:47:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 1875370214726deb622f94abac361089 SHA-1: 2b56d6a8171e6ea8b7b2ecb53acbaea918160463 SHA-256: 8d2671e0adaf6c04c21fb68fe9de26715d819eefc353447348801320c6ea8544
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/aws?keyword=all+computer+programming+languages+pdf In PDF document text
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/kusob-malafaw.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/5c8c149.pdfIn PDF document text
    • https://xanugobolenaz.weebly.com/uploads/1/3/4/3/134371028/9913271.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/6263159.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/8048548.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f92948a4c92b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f870389802f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000853c.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000853c.bin)
    • https://s3.amazonaws.com/gazitif/juwagukenomagajitolusife.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/8th_grade_math_placement_test_california.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/50133637338.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/19473436679.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/dafemel.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/aspects_of_growth_and_development.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/blank_world_map_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/breviario_dos_politicos.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/54835368071.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2844/7900/files/dd_3.5_handbook_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0698/3829/files/23893961662.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9426/4996/files/trane_xe_80_service_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/5700/0860/files/what_is_the_octet_rule.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_off0000853c.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000853c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x853C 5464 bytes
SHA-256: 219961555b439b8e82c2c55061a66cdcb0d50895ceb796e8b03ad9dc324b987d
font_01_sfnt_off000097b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97B7 11948 bytes
SHA-256: fe2a48b50a63f0574f797fe2b36a5881b43c56edcdabf67d974c5dbf3a1e5885