Malicious PDF — malware analysis report

Static analysis result for SHA-256 79cae8a221477ecb…

MALICIOUS

PDF

49.0 KB Created: 2020-10-01 23:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 28bbcc53d9f3ba85b2b3dc8d6c0dd984 SHA-1: a5afc456f30d18e14541af9f24821006cdcf7e03 SHA-256: 79cae8a221477ecb16015da40eaff288a4e30e1dd5c1b3e88b1939431433fc4f
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/strik?keyword=vampiro+la+mascarada+quinta+edicion In PDF document text
    • http://wisedemiw.bodyprose.com/uploads/1/3/1/4/131438860/xirarewa.pdfIn PDF document text
    • http://files.rescuecandlewoodmountain.org/uploads/1/3/1/8/131871956/941651.pdfIn PDF document text
    • http://files.manuelengel.com/uploads/1/3/2/7/132741693/kogijagigab.pdfIn PDF document text
    • http://zugiwav.radiantspirittransformations.com/uploads/1/3/2/8/132814930/5d769c751aeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/03f70413-7c69-4dd3-bed8-fa49ba415de7/28775538105.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d68bbb86-3529-4139-b9d6-787c84ea2802/kakalowotur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f976a12c-e243-4256-bfe6-2ef183d56fe1/rirezixulawigerepez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ea54dba-9e6b-4dba-906b-a2ae0361e2f8/54413787279.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8693/7248/files/bm_tron_games.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4059/1003/files/bye_bye_birdie_song_list_with_characters.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4477/7383/files/76415939713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4041a2ed-4784-4832-8bca-86f3d84eb94b/mabavopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d771cd59-aee2-4201-844d-18bd666346d5/56166844202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f03be133-969c-4ed3-a6c6-55f4cb8cd4ec/79712250356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd379a10-f26c-48e9-8a8d-9872c2e355fb/28806850669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3b25fc2-df37-42ff-b2d9-938909907706/juvex.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_off00007e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E5D 5308 bytes
SHA-256: d4b3f56798eced35e2dcb1795e161865bb6ea0b8af9921ac9cd8d494dcb4ae00
font_01_sfnt_off00009055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9055 11448 bytes
SHA-256: 5ff13843f7cf4412264d45eac9f20293ff7e1ec7191253b16c93de1e60ba20fe

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