Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4fd433104c38c8…

MALICIOUS

PDF

39.5 KB Created: 2020-10-08 19:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 245a46d163b60778bda4ea034d9606d8 SHA-1: 24b2122b8af4ed4db303dd10ef56f99f935b05e1 SHA-256: ad4fd433104c38c8e8829f99f7474824bf430f06e573bba39f24fb80177338b7
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=civil+3d+2018+pipe+network+tutorial In PDF document text
    • https://site-1039661.mozfiles.com/files/1039661/lefolasirelad.pdfIn PDF document text
    • https://site-1038799.mozfiles.com/files/1038799/43578045666.pdfIn PDF document text
    • https://site-1043569.mozfiles.com/files/1043569/32556072799.pdfIn PDF document text
    • http://gapoto.redwood4h.org/uploads/1/3/0/9/130969525/nanuva_xofol_zurobuxelupete_jodidabitito.pdfIn PDF document text
    • http://files.hardawayart.com/uploads/1/3/1/8/131857284/c5fab.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/1/0428/0667/3575/files/3d_movie_maker_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4206/3004/files/aeon_air_conditioner_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5791/3754/files/17165506276.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7126/1854/files/tiwuvonejax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7370/2550/files/vofetifanonamodidunaxogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0be63150-2508-46af-a114-122924646467/vakus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee497708-49e6-4eeb-825a-dfbfcc1d8c87/rajufenufabemekifaposo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2299b465-6afe-46d4-bd15-4caafe90ec40/36760692165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/531ce212-6e5a-4dc5-996a-235e93f6b4f8/totidani.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_off00005cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CBB 5580 bytes
SHA-256: 2b170815754a98f751d0923f1e5fd397d8e580a6cb7eb8dff1a748a2c153078c
font_01_sfnt_off00006fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE0 9840 bytes
SHA-256: bbded3f64dcbde7647954bf486533700616a30a7cfd2e48a2aa25fc789cb5e69

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