Malicious PDF — malware analysis report

Static analysis result for SHA-256 b191371ccd73f7ae…

MALICIOUS

PDF

67.9 KB Created: 2020-11-27 06:10:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2ae6f487346c4a66134ff885611acb5 SHA-1: 1e3deba62f5ddcab6f1d58010183f60880446a79 SHA-256: b191371ccd73f7ae4be7cdf406e5ebc52ffa8c0930e223d943c0bed44b10bcdf
162 Risk Score

Malware Insights

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

The PDF contains a SE_INVOICE_LURE heuristic firing, indicating it attempts to impersonate an invoice or payment request. It also contains a critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic, pointing to the URL https://gettraff.ru/strik?utm_term=frederick+douglass+letter+to+harriet+tubman+answers, which is known to host malicious redirectors. The ML_NYX_PDF_MALICIOUS classifier also strongly flagged this file. These indicators suggest the document is designed to lead the user to malicious infrastructure, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=frederick+douglass+letter+to+harriet+tubman+answers
    • https://cdn-cms.f-static.net/uploads/4383704/normal_5f8bddd12dd6e.pdf
    • https://cdn-cms.f-static.net/uploads/4412396/normal_5fb8de960135e.pdf
    • https://cdn-cms.f-static.net/uploads/4376404/normal_5fac23b1c73e8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dofufiri/baklol_dulha_video_song.pdf
    • https://s3.amazonaws.com/pisedij/sifaludedanusab.pdf
    • https://uploads.strikinglycdn.com/files/14e64041-3a34-4934-897a-17ffc028107b/the_other_thomas_tryon.pdf
    • https://s3.amazonaws.com/gisujubolidine/53573480457.pdf
    • https://uploads.strikinglycdn.com/files/c69c78a5-d46e-41b3-b199-f604d31ace36/72615858448.pdf
    • https://s3.amazonaws.com/tigovatolis/pig_worksheets_for_kids.pdf
    • https://uploads.strikinglycdn.com/files/6d327b7c-e93c-44a8-a515-22769751e364/bulldogs_new_york.pdf
    • https://s3.amazonaws.com/nilafafakem/famunoxebiloviwarol.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c844.bin
d01af11311ca4a555bcfe7c1b60a401ca9b4ecd0b44b79421ea99a93e90cf68c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC844 5604 bytes
font_01_sfnt_off0000db39.bin
3fcb0f018e6048438af5e3ed63761439cc479a237bd777ea12e6cd5d7581efb5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB39 11192 bytes