Malicious PDF — malware analysis report

Static analysis result for SHA-256 15b14cd92fa3c558…

MALICIOUS

PDF

69.0 KB Created: 2020-12-11 22:54:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 85a0b26ae64d5eb1bedcfe1c4a033468 SHA-1: bb707e6a4d2c9f561928369cf8461ded4cd48647 SHA-256: 15b14cd92fa3c558ff33e6645f2edee7e39be735f73c6123a471a0a77d7e285b
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'traffmen.ru'. The document body, though heavily obfuscated, contains text related to a 'free download' lure. The presence of numerous embedded URLs, including one identified as a redirector, strongly suggests a phishing or scam attempt designed to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=five+nights+in+anime+3+free+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4483346/normal_5fd1193c235a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471945/normal_5fad7365511f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454678/normal_5fcb3109798a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476580/normal_5fa9ea3eae5d9.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/vozetovuxukelul.pdfIn PDF document text
    • https://detaxotipag.weebly.com/uploads/1/3/4/7/134730838/a32205d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482002/normal_5fd0f3890a639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374986/normal_5fa7089996b65.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/wumodukubaru/ccna_cyber_ops_chapter_5_exam_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4e08e8787e879898555ed/t/5fd07dfb06d21916ed6ec19d/1607499259849/real_followers_tik_tok_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0eab716f6d44b07bedc8b/t/5fc1e83b9b1ed0353820f093/1606543420119/wodoloj.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6bca0aa0dc1643a2ca0c5/t/5fce3b07662d5e24e0ce5151/1607351048722/black_friday_2020_now.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5709f2bbd740658251595/t/5fcb6cca9d29b56e4d01d335/1607167179435/fashion_tycoon_mod_apk_1._0._24.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc59635085bf90c0e1cfcff/t/5fcf2bb805f6f2780754421d/1607412664962/followers_for_instagram_app_review.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_off0000d06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06C 5592 bytes
SHA-256: 6d87cc8250fa29fb8de5e0b5f70904e940430936784dc55dd29f39ca5a312da2
font_01_sfnt_off0000e364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE364 10420 bytes
SHA-256: b99f6d7c0da65f756b37aa90826b06f3a20958e73422415f4d7cdab8d419dc7a

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