Malicious PDF — malware analysis report

Static analysis result for SHA-256 21590d869bd302ba…

MALICIOUS

PDF

49.3 KB Created: 2020-08-24 22:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b22b120dff16bc014fd9da628aef3e8e SHA-1: 333a09660ec90fb5ce993fbb95059c8db861b8e2 SHA-256: 21590d869bd302ba9fb9860c17faa6b91586f758c993ad634a298392b6edb916
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.com/pify?keyword=dungeons+and+dragons+e5+character+sheet+pdf In PDF document text
    • http://rimupe.mascotsworld.com/uploads/1/3/1/6/131606490/55d349286.pdfIn PDF document text
    • http://duloma.proteus-mrighifu.net/uploads/1/3/2/6/132696212/7096747.pdfIn PDF document text
    • http://files.productdevelopmentmachine.com/uploads/1/3/1/3/131379543/9890786.pdfIn PDF document text
    • http://files.dbtdelaware.com/uploads/1/3/1/3/131384380/1692230.pdfIn PDF document text
    • http://files.mayoandsonconstruction.com/uploads/1/3/0/7/130776529/8332254.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/1/0433/8555/3061/files/fuziwexisuwefukedejaro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5429/1354/files/kibuvulemagubosumabowixaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8709/4177/files/jupaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0329/5382/files/zudevenipajukeja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6107/6387/files/4445805205.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8072/9251/files/pibunexetilewafatib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4946/0636/files/sosugipok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8056/4392/files/logevad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4494/4542/files/bahaya_merokok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3607/2341/files/26_11_mumbai_attack_full_movie_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9386/8187/files/nulesobijigaxuxima.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_off000082d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82D9 5508 bytes
SHA-256: 1eb5d0bb96f9681cebb80a9eb5694f4d5a835646c0c76ab136f4933c07dc2f8e
font_01_sfnt_off00009597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9597 10136 bytes
SHA-256: e89a332a21d3a5df6985d8cd649149535cd73b1d591811c7cdd49d9a8d285d89

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