Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1cd04ba880ff773…

MALICIOUS

PDF

71.1 KB Created: 2020-12-31 08:50:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: dfb042897992af4c4b8427054f639cff SHA-1: e923cea0a9d1b3e0b38d4feb5f017afe02821332 SHA-256: c1cd04ba880ff773136a7b7f022805c6257d09807e823d4337e4cff06ec306be
214 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'traffmen.ru'. This indicates an attempt to lure users to a malicious site. The file also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, suggesting a broader campaign. The ML classifier and ClamAV detection further support the malicious nature of this file.

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://traffmen.ru/123?utm_term=best+paint+markers+for+paper In PDF document text
    • https://static.s123-cdn-static.com/uploads/4450240/normal_5feb33fad10c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371010/normal_5f88825047266.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/dSgjhdx/26226418641.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxesojogugu/ggih0C1/mobepobasusobo.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/jgeif5f/84162105364.pdfIn PDF document text
    • https://rajomiluti.weebly.com/uploads/1/3/2/6/132682989/3b628c006c14b94.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3000450b-c5c1-46de-871b-b6b8fa78a3ff/kosher_restaurant_lower_east_side_nyc.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/asthma_action_plan_aap.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/progressive_euchre_score_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/cardiopulmonary_bypass_procedure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ecdfdec-be07-4c70-b91a-4478e029da76/white_glass_stackers_jewelry_box.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/pomuweselemuroran.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_off0000db4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4A 5128 bytes
SHA-256: f6e81fc92b5458d3018591f9e9ee8d84fd8bc09688f8e5106eb92c1c4194b335
font_01_sfnt_off0000ecac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAC 10344 bytes
SHA-256: 85bac318c2a6c1be10fd4193f550675d441715d2aaf7e0a19e750d13566ab55a

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