Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf9cde5d8d855a6…

MALICIOUS

PDF

38.1 KB Created: 2020-09-05 22:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b9f74ffe43117adc9e7731518db60ff3 SHA-1: 4151492f43da530db4a9ceb6653b7941177cb200 SHA-256: 5cf9cde5d8d855a6e13222c891a110d7c20fb5ab94e5908ebe40258e32f2aa5a
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=inflectional+endings+worksheets In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_ecfbdfbda8f54def9e4526321483a68f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_f8e1fa5294e9462fba9e4c153de91158.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2994dd_9e8c2ecd0fc44edbb381f32d5db4cf87.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/87d215_3bb50d1113f44fac8e8dd59561a7b4a4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4479ed_362b4d49c5a64a74be6352637731b939.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/409ca8_3d9250b902dc4ef88d853ad06f519f9e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f3ecbe_4c3cdcc37b6f49d99c8002fe4fef4022.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8d57bd_27a34c1f47cb49168021b1bcbcdd7e00.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2f3216_e096bf3196434a68afe80f0a501c7469.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_69321e75780a40a9a8176810f010d66c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d7ba0f_40c2232584c0409fb15ecf02d5cbea80.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6249/1286/files/relus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6200/1825/files/circular_motion_notes_for_iit_jee.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/18714737643.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/4172/2263/files/wejoxozivixisulol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/betwixt_and_between_camus.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_off00004e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E33 5376 bytes
SHA-256: 14b02839696df2e1de5f93fedbc202ed8552ef5cc665c01705ee24e59dd02e5d
font_01_sfnt_off0000608f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x608F 13016 bytes
SHA-256: 980e84e315b2274f2c2999f8d40d6fbdcc2317eeeedb2d8c008012e5f6192b14

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