Malicious PDF — malware analysis report

Static analysis result for SHA-256 874dbd9dcdaa2788…

MALICIOUS

PDF

53.3 KB Created: 2020-11-02 17:40:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 05e5a7bdca40d23c4ad70fbcb527ddf7 SHA-1: ebe57e90bc45c8349a172ecfcae719dee2a93eba SHA-256: 874dbd9dcdaa27886e4757037681e3aeadbbefd451d8c47de2a6ad3e02e1edeb
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The presence of multiple external PDF links suggests a link farm or redirection strategy to obscure the final malicious destination.

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://gettraff.ru/strik?keyword=hell+of+sand+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5f8fdaf864a6e.pdfIn PDF document text
    • https://kesevaze.weebly.com/uploads/1/3/1/3/131383297/e7824498001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379846/normal_5f8aad1577d3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378606/normal_5f8c28a3def8d.pdfIn PDF document text
    • https://noxazifegem.weebly.com/uploads/1/3/4/5/134596672/vosedakuv-jelinotefeko-gesavadadexokin-xixebavutulij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376087/normal_5f968ce847b80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368746/normal_5f8bfc0aa45a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381531/normal_5f901d0be29a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_5f875bd5bbdce.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/jutenojamega/37922453949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23625e3c-ee28-4ec1-a73c-ff72ad729098/jidawikosejapamus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/2677/0852/files/grand_court_of_pa_order_of_the_amaranth.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/power_through_metaphysics.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_off000092f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92F8 4860 bytes
SHA-256: 62fc48107d0b073947f1e727754098339a57bc0ece0e02bbafd9f32bbe5f406d
font_01_sfnt_off0000a3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3A6 10748 bytes
SHA-256: c5d346e2d92ffc07b24e9f8cd90e1dc5a24f8d7968a5dba94ffc1fbe34935d95

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