Malicious PDF — malware analysis report

Static analysis result for SHA-256 165c42c988215d16…

MALICIOUS

PDF

33.3 KB Created: 2020-10-09 01:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: c643d111183d71a19772bef6b3f582d5 SHA-1: 9d9d609de798a0f7d23d7d6be30b8d1c0b77c32b SHA-256: 165c42c988215d16f84edaa826b466a6ede079917308f63213d205e8ca4ffabd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, many pointing to external PDF files hosted on various domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the sheer volume of outbound links and the presence of a malicious redirector are strong indicators of malicious intent.

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=gold+Zuh%25C3%25A4lter+Kelch In PDF document text
    • http://files.pptflorida.com/uploads/1/3/0/7/130776074/9991969.pdfIn PDF document text
    • http://files.coppercliffnotes.com/uploads/1/3/1/4/131453526/1673545.pdfIn PDF document text
    • http://files.hinterlandbaptistchurch.com/uploads/1/3/0/7/130738658/b882a1ad289339.pdfIn PDF document text
    • http://files.bendnaforums.org/uploads/1/3/0/8/130874285/e59111afb.pdfIn PDF document text
    • http://files.incolorartgallery.com/uploads/1/3/0/8/130874125/jusizelib-dejadepikexegu-tepomuradiru-tagev.pdfIn PDF document text
    • http://files.ppesafetycompliance.com/uploads/1/3/1/8/131856907/2705011.pdfIn PDF document text
    • http://nojinejaw.speciesmonitoring.org/uploads/1/3/0/7/130775176/8909c51.pdfIn PDF document text
    • https://site-1042711.mozfiles.com/files/1042711/33673973232.pdfIn PDF document text
    • https://site-1048574.mozfiles.com/files/1048574/25610079092.pdfIn PDF document text
    • https://site-1043311.mozfiles.com/files/1043311/xunejagibovujozimufate.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/1/0431/1629/8393/files/wegajegavanifiwamusesagin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9646/0443/files/kilegagesavuxazokadunega.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6871/7216/files/protein_synthesis_student_worksheet_coloring_activity.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5533/9928/files/63315519480.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0730/9984/files/pathfinder_precise_shot_ranged_touch_attack.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_off00004708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4708 5024 bytes
SHA-256: 6fb39ec6035422530d7b6fce172f5c84792956dd1e84c2e6b669cb538c878768
font_01_sfnt_off00005821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5821 9352 bytes
SHA-256: 292fd8db9a2adc133878fdc07a277934790bfe468cf2454218ebe1d45036658b

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