Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dde2467e670b548…

MALICIOUS

PDF

42.9 KB Created: 2020-11-01 11:07:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: fb4e495807719f89f1ba794962af4bce SHA-1: 9b8bf832063fd5094133cf94990b9607b2d22dac SHA-256: 5dde2467e670b548e87aec2f743b5fcc0eb2a0b2fc8f42f174cbae3872262737
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ggtraff.ru/strik?keyword=diabetes+quotes+from+famous+people'. The document body, though heavily obfuscated, contains this URL, indicating the primary lure is to redirect the user 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://ggtraff.ru/strik?keyword=diabetes+quotes+from+famous+people In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408987/normal_5f93da451295c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403960/normal_5f96a22161f3c.pdfIn PDF document text
    • https://liwobolavus.weebly.com/uploads/1/3/4/1/134131542/640f832d983c405.pdfIn PDF document text
    • https://tuzigopidimeb.weebly.com/uploads/1/3/4/3/134320631/2751566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368758/normal_5f90806c8bef5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_5f8ea2a54967a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_5f9c32d86a45e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379236/normal_5f9591493c1c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384819/normal_5f968c57730b3.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/fakuguvil/got_lactase_quiz_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/8824/6434/files/12037987689.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8345/4871/files/tree_of_savior_rebuild_swordsman_builds.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/65377965799.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2846/2233/files/93621871967.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0360/7702/files/bewowixilibifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cb27368-c78b-42ff-a5eb-208f7cecedcb/96306646012.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_off0000689c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x689C 5312 bytes
SHA-256: 6433c834aae3547356c150aadc0dd1c652fd11b43c79c22ca95da2adb2488455
font_01_sfnt_off00007a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A99 10468 bytes
SHA-256: e9cc0563be746ed1218a3872bada5a202dbc4d20f7efb95a7db9106d3202e81f

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