Malicious PDF — malware analysis report

Static analysis result for SHA-256 998e9d44cb9729c3…

MALICIOUS

PDF

74.9 KB Created: 2020-11-25 07:14:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4d0d7b4e03f6cd0531a8a5aceb2f9565 SHA-1: 72204d19bb37f18324bb570aa6fe56c418d009df SHA-256: 998e9d44cb9729c370cfa7cf84d27a47a9865a5c55d9aebccddab2e56e8c2f49
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, many of which point to benign-looking PDFs hosted on S3, but at least one URL, 'https://gettraff.ru/strik?utm_term=goddess+primal+chaos+mod+apk', is flagged as malicious. The presence of numerous links suggests a link farm or phishing attempt designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/strik?utm_term=goddess+primal+chaos+mod+apk In PDF document text
    • https://fabedajigunud.weebly.com/uploads/1/3/4/4/134480588/napowoxalazi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401545/normal_5fac4722d6945.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/netinuwa/parisien_night_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/berkshire_hathaway_annual_report_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/xiloza.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/tc_helicon_voicelive_2_update.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/16957626123.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/precipitation_reactions_worksheet_2.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/germany_unity_day_celebration_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/gazixewivetira.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/bcmon_free_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa15ead2-6d42-4eda-935c-7c8a41f4605b/84009469354.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_off0000d646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD646 3088 bytes
SHA-256: c67a6d2117801d994a064b7f16b34042f0edff432d011cdc8d130fb52f26f51c
font_01_sfnt_off0000e146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE146 5408 bytes
SHA-256: d180c4bda2ef98389206bee6ef0ca2354c78e409634160191049b36ce7cfb9d3
font_02_sfnt_off0000f37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37A 14356 bytes
SHA-256: 46d4c4d33297eb313c339b5f432919861f36cb18943d8344247c0cb98c0eeaf5

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