Malicious PDF — malware analysis report

Static analysis result for SHA-256 f335d47cdef116d4…

MALICIOUS

PDF

50.1 KB Created: 2020-11-02 01:52:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6f886c4d298e85327f90198b85109baa SHA-1: ef8294c19b85a326302003b36f01937eaa50d5b0 SHA-256: f335d47cdef116d4e0e008b1c50b8bb478af5d5fe753b5fa6c343e61b853ad83
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains numerous links, including one pointing to a known malicious redirector at 'https://cctraff.ru/aws?keyword=klein+cain+high+school+spring+tx'. The document's structure and embedded links suggest it is part of a link farm or phishing campaign designed to redirect users to malicious sites. The presence of multiple PDF links and a redirector indicates an attempt to obscure the final malicious destination.

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/aws?keyword=klein+cain+high+school+spring+tx In PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/cc0b5212d.pdfIn PDF document text
    • https://wulenewovifof.weebly.com/uploads/1/3/4/5/134588468/a44cad11ceb79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382973/normal_5f8d121a1c4c5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/97961746862.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3298/3190/files/jowumobi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4178/2946/files/6788758349.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7580/8661/files/kaganagejojeloxebofe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/9481/7948/files/how_to_find_area_between_two_curves_on_ti_84_plus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7628/1032/files/comportement_humain_et_organisation_6e_dition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4359/3109/files/esl_listening_quizzes_apk.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009767.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9767 21904 bytes
SHA-256: 1229883e5b592dd00344f2dd0b725c46ca68fe7f931c77f56aafc6a6e99aa5dd
font_00_sfnt_off00006106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6106 5232 bytes
SHA-256: d8f04e2c855ae9575c727333775e1ca3b225214cc6e53124648e5a7ed7c9b269
font_01_sfnt_off000072db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72DB 10612 bytes
SHA-256: d326cd43d7d4fe0e79712e4a39162208fd5898d1e660e28774628bdc6af24901

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