Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20f8efc5e4a254c…

MALICIOUS

PDF

52.3 KB Created: 2020-11-05 02:03:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9404cfc19c4c0956a165693d61fd9461 SHA-1: 14ae7e28608c46eaeddbe9b9c8b1e1e670b4d947 SHA-256: f20f8efc5e4a254c09266836f1fa3d1dddbe16aeffb6bb9dbb0c3f99856bb53f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The embedded links likely serve to direct users to malicious websites, potentially for phishing or to download further malware. No scripts were extracted, but the presence of numerous external links suggests a content-driven lure.

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=red+a+crayon+s+story+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377935/normal_5fa045d952ef2.pdfIn PDF document text
    • https://voteriboxovoviv.weebly.com/uploads/1/3/4/3/134352377/2a43ae874f117.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f86f4615f374.pdfIn PDF document text
    • https://repafajekojila.weebly.com/uploads/1/3/4/3/134305679/febifunosogosej.pdfIn PDF document text
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/deguwoja.pdfIn PDF document text
    • https://nurobajaxi.weebly.com/uploads/1/3/4/5/134507542/sufumet.pdfIn PDF document text
    • https://rexavinuzuna.weebly.com/uploads/1/3/4/3/134308075/7280594.pdfIn PDF document text
    • https://wekasekizoturir.weebly.com/uploads/1/3/4/1/134131482/cefbea69f6.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/suzitivasekoga/free_printable_questionnaire_for_a_teacher.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/vivedatewagoponevij.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/final_fantasy_type-0_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf50f072-8956-4d07-a42b-30e496fe3afd/lighting_direct_coupon.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/immutable_infrastructure.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_off0000806b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x806B 4964 bytes
SHA-256: 39bfb7e27bf7dcde85950ed65f4c921f4537336011a7aa724be0774d722ed9d3
font_01_sfnt_off00009158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9158 10748 bytes
SHA-256: 8b20280aaf68aa906335d26ab2c9d75c178a5af7c7b044ac79bd77d819b40707
font_02_sfnt_off0000b633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB633 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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