Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f42771580373a3c…

MALICIOUS

PDF

86.0 KB Created: 2020-11-21 20:13:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a21d0d08db2b3fc57e622befd5cb2f4f SHA-1: 783e3cfeada6988e1743c1d455967d85dde203da SHA-256: 9f42771580373a3c418dd06b3bcc04439befd16e9f7f479487b44dd0f16201d2
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to S3 buckets and other cloud storage, which is indicative of a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://cctraff.ru/aws?utm_term=android+bytebuffer+limit'. The presence of urgency language further supports a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/aws?utm_term=android+bytebuffer+limit In PDF document text
    • https://xakekulipekez.weebly.com/uploads/1/3/4/3/134350488/babukevikexi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419637/normal_5fb41246719da.pdfIn PDF document text
    • https://nometiru.weebly.com/uploads/1/3/4/3/134379396/lewolukujel-zajuwi-lefegakapakol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370078/normal_5f8922044811d.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/nawosineromigi/46906753950.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/four_marks_of_the_catholic_church_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/657d6fd3-e16d-4f04-a462-7a2112621a9b/46765173323.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/eye_of_the_needle.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/guide_signs_drivers_ed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8c0c415-04a5-401d-a83c-463cf3e9384f/botapigusuz.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/dukadinex.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/varojetezesiravakug.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/kuramosuvulomodav.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/notafopuvukemake.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/3282756270.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_off000115b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B6 4896 bytes
SHA-256: 748a920fb273c372e5345b47549ebc011bcacc402873972c5825cd31d58c01c3
font_01_sfnt_off00012655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12655 10516 bytes
SHA-256: 53f1dabde59ba2f28e6b0d04880bbad7d45f9267c82873f7ae807d1982b43d3c

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