Malicious PDF — malware analysis report

Static analysis result for SHA-256 0627a3c16be8f25b…

MALICIOUS

PDF

44.1 KB Created: 2020-10-08 22:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 69ba591921741bd722e9f49260dcb0f6 SHA-1: 1401cd33bc12c0909166ad31bb75693f7577d092 SHA-256: 0627a3c16be8f25be5c9f2b0971a45de9e9f00c2f32603472cd048aa169e0b9f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to external PDF files hosted on platforms like Strikingly and Shopify. One URL, 'https://gettraff.ru/strik?keyword=geotechnical+engineering+report+costs', is flagged as a malicious redirector. This suggests the document's primary purpose is to act as a link farm, potentially for SEO manipulation or to distribute further malicious content through these links.

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=geotechnical+engineering+report+costs In PDF document text
    • http://subun.mobilephlebotomynorthcarolina.com/uploads/1/3/2/6/132696021/9ad6ca3f.pdfIn PDF document text
    • http://files.ciasulli.com/uploads/1/3/1/4/131406403/muvimaje.pdfIn PDF document text
    • http://files.fitnessrebornuk.com/uploads/1/3/0/8/130874655/2722971.pdfIn PDF document text
    • http://sumipagum.lldrq.com/uploads/1/3/2/6/132696323/jumunubulemis.pdfIn PDF document text
    • http://files.richfeenstra.com/uploads/1/3/1/3/131383462/83a75ebf0d2391c.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/35dcc2fd-3117-4ead-90c8-e9ac22fe9dbd/73883244259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8955e6a2-a396-4a68-8deb-0db2a88eefaa/21588646422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae7adad5-5806-4712-a4fb-3fff18e1d14e/50722689259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67337507-d6c6-4156-a267-313c3aaa1479/74321193860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4501ff00-5a47-41f9-97e6-e98c6a7666b1/97058321863.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2335/4021/files/73292371125.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/7320/4124/files/lcd_tv_repair_in_dearborn_mi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6268/8918/files/93789532134.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8551/5938/files/vujepumalasavol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1575/6181/files/10709307587.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0460/1967/4271/files/lopitekapokuvipubot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9387/7145/files/legesomixodo.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_off00006f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F35 5228 bytes
SHA-256: eb69b9424a7e35ec0d37f2c02438bd09c7909a1bff846ab15088f506579bc2be
font_01_sfnt_off000080fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80FB 10036 bytes
SHA-256: 05cef64b88b0038c130e4a80ab89945046aab64a0ddc64f8493618a09644473b

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