Malicious PDF — malware analysis report

Static analysis result for SHA-256 520b8ee3216cdd18…

MALICIOUS

PDF

80.0 KB Created: 2020-12-30 10:34:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 38c3af28391904c6de7de243581fbaff SHA-1: 168496a02c2693e324d0790ec43945230af9c045 SHA-256: 520b8ee3216cdd183e64f071452816a4c30771d7fa9541516ee8253ea89070c4
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure. The primary malicious link identified is 'https://traffmen.ru/strik?utm_term=love+ringtones+download+mp3+2019', which is flagged as a malicious redirector. This suggests the document is designed to phish users by directing them to malicious sites under the guise of providing ringtone downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffmen.ru/strik?utm_term=love+ringtones+download+mp3+2019 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4419846/normal_5fd8a2b02ee78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476002/normal_5fe3fc3412f7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500438/normal_5fd164576536e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459625/normal_5fe92ca9c013a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420597/normal_5fbf4c8c479be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419433/normal_5fc3afd27144c.pdfIn PDF document text
    • https://nopumalazaf.weebly.com/uploads/1/3/0/8/130813483/lolulo-nopadaxipam-vataf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383160/normal_5fcf1e098440f.pdfIn PDF document text
    • https://nubazodakop.weebly.com/uploads/1/3/4/8/134850303/sesegaxakogiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483388/normal_5faff6235850c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403814/normal_5f9ee9712678d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5feaebf0ea54c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404122/normal_5f92856631d8b.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/wilugugo/possessive_nouns_worksheet_for_grade_2.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/poemario_azul_de_ruben_dario.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_off0000ee77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE77 5804 bytes
SHA-256: 68c055faa1429058c1d92adb10347cbc51a6e3ee78500d152cb399062d9922c6
font_01_sfnt_off0001023c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023C 10080 bytes
SHA-256: 30320cd021ed2f364fb081d378327f8120a72850bbd26ee76bd1ed7e7f077d9b
font_02_sfnt_off000124d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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