Malicious PDF — malware analysis report

Static analysis result for SHA-256 af03fbb32893c8de…

MALICIOUS

PDF

44.4 KB Created: 2020-08-11 19:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec9fd350e48178e38614314545f70dbd SHA-1: 1f11be22e0e180993dfa3912debce0bbd2dfde98 SHA-256: af03fbb32893c8de14fbda580c7c5ca08d998c73bdf8f40f1eb3e6b2412eb009
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a link farm designed to appear as search results for 'relaxation exercises for anxiety pdf'. The primary malicious URL, https://ttraff.ru/wb?keyword=relaxation%20exercises%20for%20anxiety%20pdf, is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous embedded links further supports a malicious intent, likely to lead users to harmful content or phishing sites.

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.ru/wb?keyword=relaxation%20exercises%20for%20anxiety%20pdf
    • http://files.deniskilcommons.com/uploads/1/3/1/6/131606208/427458.pdf
    • http://girakob.victorianfashionsociety.com/uploads/1/3/2/3/132303382/rosuvejuma-dagatedufali-lolunaxid-mowepuwuxuj.pdf
    • http://files.alibraryisonfire.com/uploads/1/3/1/1/131163740/vatanilotivu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1359/4526/files/misadijadosebedukufemalul.pdf
    • https://cdn.shopify.com/s/files/1/0431/0273/2448/files/vupazemubojumideros.pdf
    • https://cdn.shopify.com/s/files/1/0427/6197/8023/files/grammy_awards_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/8651/0232/files/19046908296.pdf
    • https://cdn.shopify.com/s/files/1/0431/2432/6564/files/kptcl_exam_question_papers_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/8785773768.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6200/files/dikitizogogipefel.pdf
    • https://cdn.shopify.com/s/files/1/0429/2830/8387/files/84028184422.pdf
    • https://cdn.shopify.com/s/files/1/0433/8306/2678/files/best_sociology_books_for_upsc.pdf
    • https://cdn.shopify.com/s/files/1/0433/9764/4449/files/kuwemejupesu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9588/files/677169248.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006338.bin
d429f2643adee31357b1a6d75b78ef849d596cd82da4518ba08ca4af8ff74f91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6338 5116 bytes
font_01_sfnt_off000074b7.bin
5f2a69b7c4f5b4262e8d42fddc206f7f168c4bf3ebccbba5fcbc0d4871dbd19d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B7 9808 bytes
font_02_sfnt_off00009639.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9639 4324 bytes

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