Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0e2c1bcf5a4311…

MALICIOUS

PDF

42.4 KB Created: 2020-10-03 06:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 2cdb8eec8e9e0830722f0ddd7f2a9cfe SHA-1: 7bc04333d97e262d89a6042aa7e1f91386c24e7d SHA-256: aa0e2c1bcf5a4311c41298f034fdf3aa4f929215aa42e8762d910a42f98795f2
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/strik?keyword=english+worksheet+for+nursery+pdf In PDF document text
    • http://pasogali.ourbipolarfamily.org/uploads/1/3/1/6/131607505/7363696.pdfIn PDF document text
    • http://files.chadelsoon.com/uploads/1/3/1/4/131437253/bixirevanawure.pdfIn PDF document text
    • http://files.triumphantchicks.com/uploads/1/3/0/9/130969469/dasax-mowoxagurodixag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5848/7703/files/the_cab_band_merch.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1184/9890/files/cherokee_park_bridges.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/5262/1728/files/chonnam_national_university_world_ranking.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4509/6086/files/nodepezejemeno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5029/4687/files/netexasofubibidonojukavug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2339/6775/files/the_story_of_an_hour_theme_quotes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0206/3780/files/8853634895.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4903/2607/files/diwovorine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d463b92-051b-4f8c-9c3b-d315c4bd1c41/jolabunonegano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2267e00b-99fb-4a51-a60c-4a91912138a4/gazexavux.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C03 5192 bytes
SHA-256: 4bcf11b5818afff7d2d4024915159809cf539a9683904cc6539419054a3e5450
font_01_sfnt_off00006dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DBD 9692 bytes
SHA-256: 77448a60ba7b664929ae33052bfa81214115005fa6a14d44496dc6c45819b0ba
font_02_sfnt_off00008ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EE7 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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