Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e799ed0e046231…

MALICIOUS

PDF

38.1 KB Created: 2020-10-02 22:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: cef69acd252cc004d9e81211896eb3e2 SHA-1: e477bc40355935a729d7d7dc48a3f658fd9dfad5 SHA-256: a8e799ed0e046231cba9808336485eed35a4ecab7def514e268fab05dd48294d
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=indira+awas+yojana+application+form+in+hindi+pdf In PDF document text
    • https://site-1036630.mozfiles.com/files/1036630/36528283122.pdfIn PDF document text
    • https://site-1037048.mozfiles.com/files/1037048/10878896573.pdfIn PDF document text
    • https://site-1036721.mozfiles.com/files/1036721/jidazivapaxuvu.pdfIn PDF document text
    • https://site-1040771.mozfiles.com/files/1040771/tuvizala.pdfIn PDF document text
    • https://site-1038634.mozfiles.com/files/1038634/42957405690.pdfIn PDF document text
    • http://dupovo.spikemclarrity.com/uploads/1/3/0/7/130738948/muxujerimimenoga.pdfIn PDF document text
    • http://files.nicholewerner.com/uploads/1/3/1/4/131438056/5783141.pdfIn PDF document text
    • http://files.lauramernoff.com/uploads/1/3/1/8/131871569/jasofumitakovub_duzaluzipus_kapatewis_nisalil.pdfIn PDF document text
    • http://files.christianlindke.com/uploads/1/3/1/3/131398347/gosatibanumarak.pdfIn PDF document text
    • http://mekamad.shesayssports.com/uploads/1/3/1/8/131871825/nazed_gulotupol_fokapawe.pdfIn PDF document text
    • https://site-1040341.mozfiles.com/files/1040341/27613002338.pdfIn PDF document text
    • https://site-1036971.mozfiles.com/files/1036971/kufalufiratafolazavupilew.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/1/0482/9800/0539/files/f_minor_chord_guitar_sound.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8646/6210/files/sakugedusamoninipo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2799/5552/files/the_narrow_road_to_the_deep_north_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9276/3039/files/dd_bounty_hunter_background.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/72689107911.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_off000055dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55DC 5600 bytes
SHA-256: a8ebd225e36b7d143f1ceca5f9d5380d0da19b687e1b6d4820cf9fb4290aa945
font_01_sfnt_off000068de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68DE 10064 bytes
SHA-256: 5e57bcd13ba5f9ec32d7933b780f4ed82bdbffe8d1c44428d90c3f2aab7e2c86

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