Malicious PDF — malware analysis report

Static analysis result for SHA-256 c282cea87ec55feb…

MALICIOUS

PDF

92.3 KB Created: 2020-11-09 18:00:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87027449c51625ead43b3049e7b6008b SHA-1: 1319ddb0971b2d3de1ba8ae1f9365a9e0c0a241f SHA-256: c282cea87ec55feb08b4a8768b2ad8f8426d3cef27d34968a7ab09cd5948462c
254 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 external PDF files hosted on Weebly. One critical heuristic indicates that the document links to known malicious redirector infrastructure, specifically `https://cctraff.ru/123?keyword=bo+ridley+spokane`. The presence of a password-protected archive lure suggests an attempt to bypass gateway scanning by encrypting a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cctraff.ru/123?keyword=bo+ridley+spokane
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/64c0d64697e19b.pdf
    • https://palidabelegofa.weebly.com/uploads/1/3/4/3/134316445/a79fa751.pdf
    • https://seririgikum.weebly.com/uploads/1/3/0/7/130739922/maxatararabi.pdf
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/bikorot_robuwuxit_xawakixur.pdf
    • https://jugubiwujivivej.weebly.com/uploads/1/3/4/3/134352954/norajekolomoten.pdf
    • https://kavanezeso.weebly.com/uploads/1/3/4/4/134477356/8a4516.pdf
    • https://muvoletad.weebly.com/uploads/1/3/4/6/134642496/wiwerelisuwuviz_wigare_xugiragagesov_loses.pdf
    • https://wusaveverafojiz.weebly.com/uploads/1/3/4/3/134338410/4885b6077fe80.pdf
    • https://cdn-cms.f-static.net/uploads/4383160/normal_5f9af658e6758.pdf
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/zelujiniv-zebuzegej-dekebowiso-rukuxedi.pdf
    • https://cdn-cms.f-static.net/uploads/4368496/normal_5fa04652dbbf5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sukedil/elastic_and_inelastic_collision.pdf
    • https://s3.amazonaws.com/piwanisaj/57603590036.pdf
    • https://s3.amazonaws.com/vawoginele/bilewititewenufowizelera.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_off00012af6.bin
21bf9f016d917ac13f4d1a7cc31cf96ec79833514c200f6e495f604536e78153		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF6 5168 bytes
font_01_sfnt_off00013ca3.bin
3144d57dcc17d6daeeebcf12c7b5e75501d89c9abdbc3e25d018312bc2c23e5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA3 11772 bytes

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