Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e041d3b3626a71…

MALICIOUS

PDF

41.2 KB Created: 2020-10-30 20:30:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 195c092c6530850b271f513f89f56f6b SHA-1: 2f65c97583b2e04ae285c28653258a57cba7765f SHA-256: c5e041d3b3626a71ebfa2e63faeef287a5efdc980096586d5ac42a0a62b21f8f
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links, including one identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain keywords related to educational materials and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://ttraff.com/123?keyword=mcgraw+hill+earth+science+textbook+pdf In PDF document text
    • https://lajojixuvoporor.weebly.com/uploads/1/3/0/7/130738555/1843e913df.pdfIn PDF document text
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/2c24a75d55.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/85f5a0.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/1236522.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/henghuili-files/mibed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2600/1315/files/probabilidad_ejercicios_resueltos_y_explicados.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7081/5897/files/76097445641.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3096/1054/files/76178640633.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2308/1378/files/ragibewajolopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a13e3ce0-6532-4d50-95c4-e67fd44ee47d/14382549288.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5732/2430/files/4796055635.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/60896017467.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6672/6837/files/99445783362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2e8241a-3b67-4e7c-90e1-eb4438e0dd02/vibomuj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000504a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x504A 5576 bytes
SHA-256: d17de1e64d773eb0fead076d05df9c896b9a3c4ca9a8fc53c82123edb6a6ebea
font_01_sfnt_off0000634a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x634A 10992 bytes
SHA-256: f2475bba9d4064b9fba725720a3717f74729c07e8eb93a148979bf4374a79833
font_02_sfnt_off000087d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87D1 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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