Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac87c22799aecb00…

MALICIOUS

PDF

42.3 KB Created: 2020-10-25 13:08:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f7f7d42e0507cd50d349a6c331164f2e SHA-1: 1dd1c65d4a6d112651d6eb7761ba2f602d7a1aab SHA-256: ac87c22799aecb00b0e25c1da881cb18a6ee9f6ae7009bff118b5a30750d66da
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious redirector links and a link farm designed for SEO manipulation. The document body and embedded links point to 'https://cctraff.ru/strik?keyword=best+hacked+minecraft+client', which is identified as a malicious redirector. This suggests the document is part of a phishing campaign or a malware distribution scheme.

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=best+hacked+minecraft+client In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f870c656ca4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5f885d522f622.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/fasanag/21907098144.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/16039701656.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/45645091297.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/tutigemibamozugutun.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/ate_ve_su_3_yandex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4361/8965/files/dolekufajatatupem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9556/5499/files/beginning_and_ending_sounds_worksheets-1st_grade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8797/7366/files/so_much_for_my_happy_ending_letra.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7081/8970/files/enfermedad_de_membrana_hialina_tratamiento.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0993/2440/files/rhythm_in_music_definition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/9770/0549/files/pensamento_e_linguagem_vygotsky_livro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7930/5890/files/joseph_clement_coll_the_art_of_adventure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a395134-6196-4f89-9ce4-e4e73c91d913/biblical_meaning_of_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab063f29-707e-4664-bde9-44caf7ea9a19/rogukorinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6680ac26-70d9-458f-a182-3df868d0ce5a/gazavubegovigogekisoju.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/telenunokeduk.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/sq8_mini_dv_camera_manuale_italiano.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/barron_s_gre_3000_word_list.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/gozelinir.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_off0000661b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x661B 5376 bytes
SHA-256: a1532845d7b9209e4f8f15718ce2e126033546701215b9b264c51aa673ec077a
font_01_sfnt_off00007834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7834 10456 bytes
SHA-256: d3afc6afcf8dda65e1ce8f5076cf0a2933912c6038af9e43c4307a0d503b5f59