Malicious PDF — malware analysis report

Static analysis result for SHA-256 77927473cfac9e4f…

MALICIOUS

PDF

41.1 KB Created: 2020-10-31 05:46:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 94949bfd89438c1eb3e23385a94addb1 SHA-1: 23de4105f626baa8109f5491f767b01daa97f7e5 SHA-256: 77927473cfac9e4f7b278c0f07c215fd9caeed3036577ac2b0c99ced2d83d7d8
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a submission form, and the presence of many external PDF links indicates a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/pify?keyword=btfe+submission+form In PDF document text
    • https://mezuxanivatanid.weebly.com/uploads/1/3/4/4/134499991/biwirela-vijilasugubufov-nufejote.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/zerejitofotug-dugejamin-dudim-ninizupewu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5f90151585b49.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/rowizapidubaba.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/tadovu/xowejono.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/bible_dictionary_free.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/bc_independent_teaching_certificate.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/82091244272.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4956/9434/files/pewadajivekad.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/29046290687.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/medicated_dog_shampoo_chlorhexidine.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0467/7763/0873/files/netcut_app_for_android_without_root.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/columbia_county_pa_landfill.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_off0000641c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x641C 4860 bytes
SHA-256: 71d6f2fb97534fcd68fc78e4530aa1a760091d49ca97353d67417a82a1239433
font_01_sfnt_off00007495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7495 10424 bytes
SHA-256: 4acbd5a4679f99efa6700d14605d7a6ecbefd8de608c7d71a21167ac560ed963

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