Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb23373674a1460…

MALICIOUS

PDF

43.5 KB Created: 2020-10-28 08:05:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f1ee13c0753484b396de04223bf9fa0e SHA-1: ba6bde3e932bfd0a2e18f70e6e00408f8c3a3d29 SHA-256: fcb23373674a146061ee18e07bf963bd30a6c0d2cbe9dfb5552de61c3e0bcc43
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to link farms and redirectors, indicating a malicious intent to manipulate search engine results or lead users to harmful content. The presence of a link to a known malicious redirector further supports this assessment. The document body, though obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and includes the malicious URL.

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/strik?keyword=toms+shoes+case+study In PDF document text
    • https://kezobonuduwu.weebly.com/uploads/1/3/4/4/134457579/27046eed0.pdfIn PDF document text
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/gegetajuzixu_saralajewazamok_livaza.pdfIn PDF document text
    • https://nadazilagola.weebly.com/uploads/1/3/4/3/134314388/dulasawusola.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369920/normal_5f88c71b60ffa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369664/normal_5f881b2d8c610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383451/normal_5f98fb432aaf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_5f8954773dadc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380858/normal_5f8fb73c0b333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367674/normal_5f965d9099e86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378149/normal_5f937ca65333a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/903e873f-259a-4032-9d74-8c919ad8d745/kamasutra_sexologia_imagenes_gra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba2cefbe-f8a5-42f7-9818-639b67e32087/76926462167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/646ad26d-abff-47c0-987e-c315dbd156fa/62968368264.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/5541/5206/files/kijifidevap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/3218/4485/files/strongest_eevee_evolution_names.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1879/2345/files/mugemabiwulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37bb21f6-b023-441d-863a-e4527dba9757/38898742860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/113eabc6-be8c-4383-98dc-350db38225ee/30890922209.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_off00006a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7A 5100 bytes
SHA-256: 78c4cada863942694c004a77a4b739309dff69072a36a4bd25350aaa86bde6a9
font_01_sfnt_off00007bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BBC 10880 bytes
SHA-256: 4ae13d20bdc2ff9deefc8883fc306dfe93c3d29cc7dcf062c1f576b729a1fb75

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