Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8af0e8ab683a9c0…

MALICIOUS

PDF

40.4 KB Created: 2020-11-08 14:23:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 444dfdfb04dadac01a67209e6455377a SHA-1: bb76f7a0f463dc29cc30272077d5114183385b20 SHA-256: c8af0e8ab683a9c06a8fc7bc38b70eff6feb7cf5fc3f1e6af228d60f7bcd5da6
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/aws?keyword=adderall+and+viagra+interaction PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408878/normal_5f9b2f931ca48.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/liluvad/lyrics_of_you_and_i_one_direction.pdfIn PDF document text
    • https://mutozofe.files.wordpress.com/2020/11/67728004733.pdfIn PDF document text
    • https://solipisona.files.wordpress.com/2020/11/ben_10_albedo_alien_x_transformation.pdfIn PDF document text
    • https://lajoluxozuf.files.wordpress.com/2020/11/ars_poetica_horace_summary.pdfIn PDF document text
    • https://babesatixin.files.wordpress.com/2020/11/custom_3d_girl_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/insert_manual_line_break_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/unifi_ap_password.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/nielsen_breakthrough_innovation_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/preeclampsia_signs_and_symptoms.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/skyrim_dragon_priests_locations.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/fepapa.pdfIn PDF document text
    • https://jigilulexog.files.wordpress.com/2020/11/maytag_bravos_quiet_series_300_washer_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/dorobiwawixefefufitora.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_off00006109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6109 4976 bytes
SHA-256: 828df8df970206d75fb6e54f20d0ceb193f2e25653bbf2e1b449e19dae95aa6b
font_01_sfnt_off0000720d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x720D 10184 bytes
SHA-256: 714cf6b3c30b4a9b5bd0821d7eaf29f244fa7a5b62070d1e25286957ac80a489