Malicious PDF — malware analysis report

Static analysis result for SHA-256 99fdd959ec947b09…

MALICIOUS

PDF

55.4 KB Created: 2020-11-01 14:26:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7d66cde542ea80403e1e5cbbb2ab9f7b SHA-1: 2d2c5d7521037fd2ba6b46af91206add0ff60e82 SHA-256: 99fdd959ec947b09807e51d192638f9880fc3b004cf2fafbc6c5843d084b004f
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links, many of which point to a redirector infrastructure known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be a lure for search engine optimization, directing users to a malicious site. The ML classifier strongly indicates maliciousness, and the presence of embedded links suggests an attempt to redirect users to potentially harmful content.

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://cctraff.ru/123?keyword=public+high+schools+in+lafayette+louisiana In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379959/normal_5f90954369227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368466/normal_5f88c6315b54e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d05bbc79-453c-41b5-8fd3-c05d185c868d/dovalobusikuvarar.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/fubilagivobunisax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1780/0350/files/zozaletamirijer.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/mikemukujabeleminuwikuv.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/red_river_hog_baby.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/90403259467.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/41612860241.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/xopasobonolit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f5f7f6a-4984-4fd6-a43f-cd9c9c2cc306/30621838542.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/facebook_payment_pending_update_card.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/ways_of_the_world_3rd_edition_chapter_19.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/mekofopunemuzositire.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/gogozewiwazumo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC0 5172 bytes
SHA-256: 8f0cc7167a8b47862dcd9751c430f118d89757fa9878e2a2ff21d668a28051ba
font_01_sfnt_off00009c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C58 11100 bytes
SHA-256: 869bd8112aca3cad6b966a7abcacf27164a16168bd2837d7d664ac35170ce8de
font_02_sfnt_off0000c1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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