Malicious PDF — malware analysis report

Static analysis result for SHA-256 160b832e938b8e0e…

MALICIOUS

PDF

59.0 KB Created: 2020-12-16 18:33:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 19d97f08a78a1dc868feb8a46108c20a SHA-1: 9495ef27b60c6b6c595876acd4af113b19a0260e SHA-256: 160b832e938b8e0ea0c6665659635ee4e12fe85eb6d021f2837fa51d41d5b001
214 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure at 'ggtraff.ru'. The document body is heavily obfuscated and unreadable, but the presence of the malicious redirector link and the link farm structure strongly indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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?utm_term=oxford+latin+course+part+1+answer+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381738/normal_5fa8a35d8d63a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391315/normal_5fbeaa199ebdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420766/normal_5f9e9fb1666d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477658/normal_5fa8e7e52a1b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425238/normal_5fc6b6407662a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414164/normal_5fa62cf975539.pdfIn PDF document text
    • https://kupanonul.weebly.com/uploads/1/3/4/6/134682697/nujolabunef_sovevamuzuri_xuwaxesasiw_magosezogife.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc3c939bd14ff0dd2ae97c9/t/5fc513c961e25426e1d8c348/1606751177981/wejanisobediwofewunodur.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/all_quiet_on_the_western_front_summary.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce08ab0db0542b884d6e77/t/5fd6d707154d727871fd8aac/1607915278167/lorde_green_light_sheet_music.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_off0000a9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9CF 5552 bytes
SHA-256: 8178e4879a40d21a8a7574af0e6c2475aa80f5df3489c47380a47e11d5f95270
font_01_sfnt_off0000bce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE7 10164 bytes
SHA-256: b1d67bb0e9c9ead51ee4e99f787bba6a5ab79e549c5530a9f914105070d2750b

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