Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5e7442e1440446…

MALICIOUS

PDF

91.3 KB Created: 2020-12-24 05:21:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 68a19fc6ade594a34a7774d37c042f64 SHA-1: d435f98a052526e9ce1c6afc432a5bb1f09eaffe SHA-256: cf5e7442e144044614b10190b164f5135e7be49ecfea8ffe78a7767a2b94c8d1
214 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV also strongly indicated maliciousness. The embedded URLs, particularly the one pointing to 'cctraff.ru', are highly suspicious and likely lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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://cctraff.ru/123?utm_term=heap+sort+algorithm+visualization In PDF document text
    • https://static.s123-cdn-static.com/uploads/4450721/normal_5fe3a605cebb3.pdfIn PDF document text
    • https://nuvofuvulaxak.weebly.com/uploads/1/3/4/6/134694516/lewofolorixozapupewo.pdfIn PDF document text
    • https://bafalado.weebly.com/uploads/1/3/4/8/134865771/9807368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449789/normal_5fd79600ef349.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/vuzotisenixava/guided_archery_elk_hunts_oregon.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/aashiqui_2_video_songs_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/android_emulator_portable.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/siwazoxefelewir.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/6485853583.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10324 3204 bytes
SHA-256: 97b734bcafa51f142028515f4a99eec5aaaf874da34b606c821a12a20d6940b5
font_01_sfnt_off00010e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7F 5304 bytes
SHA-256: 95c5829eec283a920e08a5822a06447d361a8e8ca47936a95e27b4b7c523714f
font_02_sfnt_off00012069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12069 12824 bytes
SHA-256: 28b17e0ece6711399f2f1fb75a647c1c82363559b3d758038036fa0e52b9adf9
font_03_sfnt_off00014b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B06 16100 bytes
SHA-256: c3461001ca888bed6954970c14d027cf202d908e5c0b8e175f896e5a236b6086

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