Malicious PDF — malware analysis report

Static analysis result for SHA-256 da89554c937bdec9…

MALICIOUS

PDF

47.5 KB Created: 2020-09-05 01:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 441a5fe512003ede06440fb353db9e0b SHA-1: 569fb2dca9653a644f1e96ef48413f559cd92ad5 SHA-256: da89554c937bdec90407b9c55040aaaf53c1722f4da5b51ee6888ff9c79d369d
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=agile+project+management+templates+pdf In 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/1/0434/8333/2772/files/neverwinter_nights_walkthroughs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8153/9483/files/zifudoxaverujazijit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5161/4359/files/8675019885.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83971047952.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2915/8295/files/applied_linguistics.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/314c35_6e33a27596364b85b8eebdcaa50fb3a4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_87f33e0bafed4d5fab536b8245b00c96.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b41a9a_a2f9089eac524f33bd3c9de3386f4679.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d48fe3_bd2e818a16c84c3b8619f142eed08f52.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/911c12_a61a5f27a0584126bfc9358c79362abf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7643/5612/files/11387187067.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2666/9987/files/76151209601.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9046/9283/files/3902282818.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6567/9776/files/vumeg.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7d1dc9_cfe9c917c513420f93c2dfc49a41b420.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9bd8c3_a98939a6e52748fdbdeb8ddcd021b844.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_off00007817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7817 5540 bytes
SHA-256: bc904478eeee8bd118e950eeef6f638e149c81516affadc89402c664e5220ebc
font_01_sfnt_off00008ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AE3 11296 bytes
SHA-256: b0212237bb9834affc6163f438da1c44b897fd5841bd2dd24635fa4ad3bd9eb9

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