Malicious PDF — malware analysis report

Static analysis result for SHA-256 919d6751863803e2…

MALICIOUS

PDF

44.8 KB Created: 2020-10-17 19:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: b3d3fd93544b15ed36c437dffaabdcab SHA-1: a5c000c4d84a442cd351af2c552881af9e19b2fd SHA-256: 919d6751863803e22da929416034c0b2a569d91e67f528742c06061db57b76cf
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ggtraff.ru'. The document body also contains this URL and numerous other PDF links, suggesting a link farm or redirection tactic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lure users to malicious sites.

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/123?keyword=ecografia+obstetrica+rumack+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371508/normal_5f8a70f0f37f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369163/normal_5f881277c5062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372072/normal_5f894847eb7cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5f889fa0ba58b.pdfIn PDF document text
    • https://jowodetuleguzu.weebly.com/uploads/1/3/1/8/131856173/58dce66.pdfIn PDF document text
    • https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/294c4dc0e.pdfIn PDF document text
    • https://fidegobopoj.weebly.com/uploads/1/3/2/8/132815019/cd6d1.pdfIn PDF document text
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/lujezawagonob-fovalejaf-voxisutedimemi-zazoguwek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5106/4228/files/2419621791.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3321/5654/files/54842355444.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2876/0741/files/harley_davidson_watch_battery_replacement.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6931/1650/files/biraz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0063542a-2330-4d5d-9d69-2060c1252546/zorusexizolof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/224254ef-f2a2-4ac6-a1de-b597df121d86/pejalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffd60285-cd16-4526-8c68-fcaf3cffdc91/silimeru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efde6aa9-9735-4d10-95bc-1f12f5766091/61133993025.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2116/8540/files/spanish_1_final_exam_multiple_choice.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2431/8103/files/waripegufude.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1609/3335/files/color_mixer_pro_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/4835/1944/files/48772574888.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5176/2343/files/rosemount_8732em_manual_espaol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4464/9630/files/63449951836.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/3123/3180/files/prefijo_latino_campo_crucigrama.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_off00006717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6717 5604 bytes
SHA-256: d573b8f323a6c3f802d362b7e6ed043e879e62b93e149a3d4d7584f65928d027
font_01_sfnt_off00007a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A0A 13572 bytes
SHA-256: f3bf7c507ae47d3aab24c9b38006d7f833ae73ebcb76beb6de699e6ee75e3b5d

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