Malicious PDF — malware analysis report

Static analysis result for SHA-256 314d833b36b7764f…

MALICIOUS

PDF

52.2 KB Created: 2020-11-09 10:46:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-09
MD5: c1794f0dea578d61b22b99c729726b8b SHA-1: 473f753967bd843aa8c8f6cb47cc21a8cc2e4114 SHA-256: 314d833b36b7764fb4ffea9cb5d0e519e540c011a347468d2ba097682e8e5d59
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/aws?keyword=windows+7+emulator+android+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368475/normal_5f9a671ee1b45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428054/normal_5fa1d0c331dd3.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/suxugipipolazog/10777069538.pdfIn PDF document text
    • https://fimalul.files.wordpress.com/2020/11/xenikefeg.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/free_flash_games_unblocked_weebly.pdfIn PDF document text
    • https://tadegekana.files.wordpress.com/2020/11/vitomokevonixadibevu.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/how_big_is_a_shot_glass_nz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf200d0-8e1a-41e1-b995-3a17da3f86fb/fudukowanejuvotakis.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/pathophysiology_of_diabetes_mellitus_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/effects_of_pollution_on_humans.pdfIn PDF document text
    • https://pokavatirog.files.wordpress.com/2020/11/55610994827.pdfIn PDF document text
    • https://nuvinifiraf.files.wordpress.com/2020/11/the_moving_man_distance_displacement_speed_and_velocity_answer_key.pdfIn PDF document text
    • https://zowawalu.files.wordpress.com/2020/11/58313788102.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/astm_a106_grade_b_specification.pdfIn PDF document text
    • https://vonunemeruje.files.wordpress.com/2020/11/5255724188.pdfIn PDF document text
    • https://fodabijiwifi.files.wordpress.com/2020/11/dafigopewupirikama.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_off00007658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7658 5356 bytes
SHA-256: ecc1d6d9150405f599c275c414fbd870cf2b604da13006011600de23c3c1ac24
font_01_sfnt_off0000888f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x888F 11308 bytes
SHA-256: 75514466b17f2b9998867be837ecbf5026611be42b778d102f0ac001e10cfc94
font_02_sfnt_off0000ae02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE02 16184 bytes
SHA-256: b7d5ad0f1df21e8de309569219704aee6faf8fa1a30a8da299132787534465aa

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