Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a8bccc7b01ec84…

MALICIOUS

PDF

39.9 KB Created: 2020-10-07 07:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: c5d539c6c83bd87ce3e0f370e58c962e SHA-1: 972acb0e7065ddd7565fba2aa88ca6b83cb4a350 SHA-256: 86a8bccc7b01ec84643ca0889fadf712fc55fe33feeeefe9239e8e78474296e4
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://ggtraff.ru/pify?keyword=understanding+analysis+abbott+3rd+edition+pdf In PDF document text
    • https://site-1036699.mozfiles.com/files/1036699/nebasikal.pdfIn PDF document text
    • https://site-1039661.mozfiles.com/files/1039661/kudofuluroma.pdfIn PDF document text
    • https://site-1037019.mozfiles.com/files/1037019/45448561396.pdfIn PDF document text
    • https://site-1037102.mozfiles.com/files/1037102/55636337865.pdfIn PDF document text
    • https://site-1043541.mozfiles.com/files/1043541/piwakazerarenoxitutik.pdfIn PDF document text
    • https://site-1037166.mozfiles.com/files/1037166/fudumumo.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/1/0433/9000/9502/files/4426290920.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6620/3029/files/21999515304.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7875/3697/files/maulana_tariq_jameel_contact.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5709/3029/files/pool_closing_kit_contents.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/6424/2588/files/one_word_sentence_game.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9081/2821/files/whos_afraid_of_virginia_woolf_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2352/4255/files/19450378847.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5492/3925/files/69153438699.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7617/3472/files/naming_alkanes_alkenes_and_alkynes_quiz_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/5645/0714/files/congdon_school_new_bedford.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_off00005da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA5 5604 bytes
SHA-256: 60a5a02c57dd987b74d5f729e67ed2d40b893b62d2157eeace484c9e0dd9e2bd
font_01_sfnt_off000070ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70CA 9976 bytes
SHA-256: 846d28ea57504181c8061a73fa00e64f1280a8f75d3298cf69a9df50741ad53c