Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe09c64c50d5b9f…

MALICIOUS

PDF

32.1 KB Created: 2020-10-30 14:47:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 49591ab3102abff278a3e0b469b4b6b4 SHA-1: 7523664798e3db1ba6ce6643e498d815cda27703 SHA-256: 5fe09c64c50d5b9f24b35c222cf4c484628caf09c842fc1f44388f7d314e5270
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://cctraff.ru/123?keyword=boc+study+guide+5th+edition+free+download'. This link is likely used to direct users to a malicious site. The document also contains a large number of embedded links, many of which are to PDF files, suggesting a link farm or SEO poisoning attempt. While no scripts were explicitly extracted, the presence of embedded URLs and the malicious redirector strongly indicate an attempt to compromise the user.

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://cctraff.ru/123?keyword=boc+study+guide+5th+edition+free+download In PDF document text
    • https://jomitapekox.weebly.com/uploads/1/3/4/3/134319499/d032f7d7dae.pdfIn PDF document text
    • https://nivozigagu.weebly.com/uploads/1/3/4/4/134439663/14ad42d7bd348e.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/sugapojere.pdfIn PDF document text
    • https://xonuvalax.weebly.com/uploads/1/3/1/4/131437330/komijatolejon.pdfIn PDF document text
    • https://nakumupapetiz.weebly.com/uploads/1/3/2/7/132741615/2615435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376629/normal_5f997e18dac03.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/zugutixe/beauty_tips_in_malayalam_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3499/1518/files/ronawijeviratatuxamo.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/alto_saxophone_finger_chart_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/mifun.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/42855707924.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/construction_carpenter_business_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/begasidomuvomid.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_off00004057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4057 5652 bytes
SHA-256: 367145292ec09551cacd3ac74099d51fd3fdfa85ca1b508c9e5b59b343c60d47
font_01_sfnt_off000053aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53AA 9316 bytes
SHA-256: 0804eec27fdfa67c2477ac9677bf674267c5f37d14f35a1c93c67b00062694dd

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