Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb0a456ec0837b3…

MALICIOUS

PDF

50.4 KB Created: 2020-08-07 21:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 681d7ef138b87feabb074b49135b9131 SHA-1: 254fbcd104e0b26b6ffdd65a126813af5abbaf5e SHA-256: 4bb0a456ec0837b3e8446d2afc1e4560b710d1b0b59ab8f0f66fa40740cf4a63
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://ttraff.ru/pify?keyword=amazing+spider+man+comic+book+pdf In PDF document text
    • http://files.fitwoofitness.com/uploads/1/3/1/0/131070849/7796017.pdfIn PDF document text
    • http://xolixil.starkvillepride.com/uploads/1/3/1/6/131606069/1461997.pdfIn PDF document text
    • http://files.257bennettstreet.com/uploads/1/3/1/3/131379268/18e6dda1b.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/1/0427/4287/4278/files/sosial_budaya_adalah.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/76150416654.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0593/4757/files/kezibitudowesexibodozi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3544/3875/files/masterbuilt_30_inch_electric_smoker_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2290/7549/files/gijupofalorosapasa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9811/2167/files/35562989666.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/1949/6606/files/7_sins_game.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2532/5467/files/ave_maria_beyonce_sheet_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1839/3499/files/33353336051.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9378/4728/files/93108274960.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0936/7454/files/conan_exiles_ports.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_off00008617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8617 5688 bytes
SHA-256: 9ffe1adb8ca8df49ff6d8252c810ec734e52bfc3496077297b325af173999955
font_01_sfnt_off00009969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9969 10364 bytes
SHA-256: 1aebf1d1bb67a53c7578512848d0a4929c1267a43397579395f883dc9ea667aa

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