Malicious PDF — malware analysis report

Static analysis result for SHA-256 17855f2755885117…

MALICIOUS

PDF

47.9 KB Created: 2020-11-03 20:35:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6382cf4cca4c81e90bdad684d02df758 SHA-1: 5223c696e13ace36bd38f2d8a6d0271859fb16b1 SHA-256: 17855f2755885117eeb27cbb74651c0a459bea78ed863cd6823a29351a286796
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources, a technique often used in SEO link farms to manipulate search engine rankings. One prominent URL, 'https://ggtraff.ru/aws?keyword=criss+cross+book+by+lynne+rae+perkins+summary', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting an attempt to drive traffic to malicious infrastructure.

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/aws?keyword=criss+cross+book+by+lynne+rae+perkins+summary In PDF document text
    • https://pejilajapife.weebly.com/uploads/1/3/4/4/134477767/8975126.pdfIn PDF document text
    • https://kibutabez.weebly.com/uploads/1/3/4/4/134438896/7357a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393345/normal_5f91f2cd31fa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424951/normal_5f9cee342c1df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368248/normal_5f912eedaa0ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382973/normal_5f8c48f97a3b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446155/normal_5fa1291237646.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://s3.amazonaws.com/memul/11225243663.pdfIn PDF document text
    • https://s3.amazonaws.com/wisatutadi/zesukofopiwefirekutaruni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c91fc3e4-0efe-481a-a65a-c8861b55ce1f/52789426677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ecda7a6-d094-4971-b3a0-ed4c30f60d78/the_daily_star_bangladesh_newspaper.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/cultivo_de_arveja_en_bolivia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e16bfac7-e956-436b-ad53-7bbf6b814f56/87259116146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13f57b71-e62e-4384-ba4d-389a95f6e10c/2002_dodge_dakota_engine_code_p0455.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/68160349906.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_off00006de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE4 5212 bytes
SHA-256: 12754e046e1c75b99c29a209fe2599848ee32a982c5991cdf333fc7996aefa72
font_01_sfnt_off00007f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F81 10912 bytes
SHA-256: 155c25ea2065539ea44d9bf357bcd46e34f94efa627a5fdcb7074efa90197429
font_02_sfnt_off0000a48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA48C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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