Malicious PDF — malware analysis report

Static analysis result for SHA-256 a867d640c8c85aee…

MALICIOUS

PDF

43.4 KB Created: 2020-10-04 20:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: d9f944abc1db801b45678ca96b966704 SHA-1: 67856f48490ddb3a91ca951828303da0299cccd6 SHA-256: a867d640c8c85aee3f0eb2555167e19ff5acfbafadebcd9982c81e6acb0ce49e
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=dc+circuit+builder+parallel+circuit+worksheet+answers In PDF document text
    • https://site-1039351.mozfiles.com/files/1039351/mejubimawawesiwujolex.pdfIn PDF document text
    • https://site-1037035.mozfiles.com/files/1037035/bolelekemolokinopew.pdfIn PDF document text
    • https://site-1038472.mozfiles.com/files/1038472/lubibidi.pdfIn PDF document text
    • https://site-1039420.mozfiles.com/files/1039420/lavixefajigeva.pdfIn PDF document text
    • http://borumap.viana-motion.com/uploads/1/3/2/6/132683138/livupurikub.pdfIn PDF document text
    • http://files.rotboxrustorations.com/uploads/1/3/2/7/132712348/638536.pdfIn PDF document text
    • http://files.deleonlab.com/uploads/1/3/1/1/131163695/xizigit.pdfIn PDF document text
    • http://rifowaz.goodlove.shop/uploads/1/3/1/0/131070306/javone_lununerexofumuw.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/ee75f3bb-b083-479b-8cb3-ca79231550bd/53649378499.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13a6a72d-45e4-426b-949a-8e3106306e1e/52457966660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42e004e3-fb5a-4783-828f-2a20f4fd2d95/45996059741.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9301/9810/files/vajupegeleveki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3841/4760/files/75009773279.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6759/5165/files/replacement_faucet_aerator_sizes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2718/5311/files/tabizewemedam.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_off0000685a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x685A 5456 bytes
SHA-256: 083103ec28a3e5d82d40a970b3a5d244f49e809e5c36f0a6812fced80acbab22
font_01_sfnt_off00007af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF1 11108 bytes
SHA-256: af4b8053ee36aa99757422dc87706548de01b3c572b789b838101abf6038d392

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