Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1545b74a88b02e…

MALICIOUS

PDF

67.7 KB Created: 2020-11-14 00:40:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d8bcabc0ba746f8d80aec72cd7b3ab05 SHA-1: d5e3f33f5de0f356d9fe96cbf679fb64297ab9f3 SHA-256: bc1545b74a88b02e4b1faa871980b1b4597c4ae227ceedc1e8bd64bdde8e2d6b
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically 'traffmen.ru'. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'proving parallel lines proofs worksheet', which is likely a pretext to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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=proving+parallel+lines+proofs+worksheet In PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/kizerapu.pdfIn PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/mewiwana_mugepako_lupotezedapa_kedugegasijes.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/tujeviwakirawu/91549168174.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/kajudufebatexo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9077caef-2fae-4f3e-966d-3dc772a4dc8b/learn_build_earn.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/libros_de_biotecnologia_vegetal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c767ce2e-bcf1-4388-be86-ad858713adbc/17208464670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce4a6d96-30ab-485c-90c9-6f666f406737/ririgugeruxatotiwojezawej.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/dojufomusigowumatifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61f7082b-ca40-4790-a8f6-cf8907bfdd84/gowise_usa_pressure_cooker_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf74ae81-49c3-429e-87cb-d049fecbe452/how_to_be_a_modder_on_gta_5_xbox_one.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f4601a2-2878-4dab-b6d7-70b94839c2d0/tipexaxasolu.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_off0000cc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC55 5380 bytes
SHA-256: 32e8f4707f0127524b807dddfa7dfc34d509ca3578703f3fead6402ddb53c873
font_01_sfnt_off0000deb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB6 10468 bytes
SHA-256: 5b04458f16d7b40b744266a62482f8330b8adf7d5025747cb1f87fd84e8fb2ff

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