Malicious PDF — malware analysis report

Static analysis result for SHA-256 b947790c00c453dd…

MALICIOUS

PDF

58.7 KB Created: 2020-11-11 02:50:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: da024e5903251c9c196e5648bc5991e9 SHA-1: 2a5ec80959183c00db139271603fbc8dfde0d242 SHA-256: b947790c00c453ddbb4f923811136f5fdb8d73d3841ab3e9ac99c5b87ae2e488
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged as malicious by multiple heuristics, including a critical alert for a redirector link to a known malicious URL. The ML classifier also strongly indicated maliciousness. The embedded URL `https://cctraff.ru/123?keyword=empanadas+colombianas+youtube` is the primary indicator of malicious intent, likely serving as a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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=empanadas+colombianas+youtube In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383679/normal_5fa53cffdb987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383794/normal_5f90de6a6bb55.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/fajixe/81387872144.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3bb639f-dbf1-4b93-9e19-ba21ad3eae2a/59795819988.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/best_annotation_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dff142a1-4342-4583-bd83-22586fdaec12/the_impossible_quiz_unblocked_games.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/carb_cycling_diet_plan_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/24656017618.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/momo_app_download_android_china_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/c_section.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/motebelubigazegomi.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/modiburemutug.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/5052686228.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/wamix.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/fepefomidimufaku.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_off0000ae86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE86 5320 bytes
SHA-256: b75e4033bb5dcc9e5b38aeabe0c3955790528a92497795484840df9f3a88a3a2
font_01_sfnt_off0000c092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC092 8588 bytes
SHA-256: 6116b4ebed132faef94938fe8550abc86dfdb5eb99fc53a15cd9257a46fc7851

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