Malicious PDF — malware analysis report

Static analysis result for SHA-256 78426f93639f8902…

MALICIOUS

PDF

48.5 KB Created: 2020-10-26 21:07:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f178633b10c8073daa58bd6a0ba153ad SHA-1: 8c0d0024102f73bbc22385dd2aaae4a11050ce70 SHA-256: 78426f93639f8902e774ed107518cbdd2a17694627404d593ddc9a8b2d8c816f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating it redirects to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary malicious URL identified is https://gettraff.ru/strik?keyword=penn+jillette+god+no+pdf, which is likely used to funnel victims to further malicious content or phishing pages.

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://gettraff.ru/strik?keyword=penn+jillette+god+no+pdf In PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/bdb542a6d217.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/ruzevemibuwo-rugezigamivo-jikujiviruxe-suxubamitu.pdfIn PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/sudigefi.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/2b7e13a68ac087.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/6e709fdda73c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388279/normal_5f94676a805ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369343/normal_5f8e040353fbf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/arabya_rajani_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/75385522281.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/berapimenugipo.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/nokaxazepudavunized.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/lekaledutuzugemomip.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/cpr_procedure_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5414/0054/files/google_camera_apk_for_oneplus_7t.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6545/0391/files/stronghold_2nd_edition_rules.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3120/6808/files/evaluate_the_integral.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8393/2582/files/godeduveteluwofov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8177/5287/files/ies_2020_general_studies_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/negative_effects_of_water_pollution.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/jemogup.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/nekevexulevefaragonuje.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/geroxuf.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/research_on_anaemia_in_pregnancy.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B35 4804 bytes
SHA-256: 89858c4cde28da41a8abb3d764e0b871bc67468417785f4b8cf8d04c66ecec19
font_01_sfnt_off00007bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB1 10556 bytes
SHA-256: c305fdac3004055460f5b0200e998f51e9a9b86d1c4374e97c3dad986f85f87b
font_02_sfnt_off0000a021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA021 16028 bytes
SHA-256: 0bae8649ba252bcfab81cb8324cfe1737d73e47191b507e117e6d0858e0066a8