Malicious PDF — malware analysis report

Static analysis result for SHA-256 55efaa5450aa2ecb…

MALICIOUS

PDF

47.3 KB Created: 2020-10-18 04:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b6e08a28278d0bf536207535d02e2317 SHA-1: 95284df401930d6e32e22ddd7524f8cec002d0a1 SHA-256: 55efaa5450aa2ecb3647245023041fb87540f4303d41fe5bbf8d18e7137e7da3
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content.

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://gettraff.ru/123?keyword=safety+signs+and+colours+pdf In PDF document text
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/xojotupexo_venoxixipup.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/wegedarekon_zixaluwifaxuves_muwobefakufixi_gitogezumi.pdfIn PDF document text
    • https://segakimorepej.weebly.com/uploads/1/3/0/7/130738797/477c3af4540.pdfIn PDF document text
    • https://godadonalizubo.weebly.com/uploads/1/3/1/4/131437317/863c11b58171e.pdfIn PDF document text
    • https://dudikojegak.weebly.com/uploads/1/3/1/4/131406444/jibutunutesinidinite.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f872a0774989.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5f872cab5edfd.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://uploads.strikinglycdn.com/files/dfcba018-8ec9-4bc6-b062-956ecae4647a/xukupowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b1f03c-d857-4616-b7e6-e8b91494897c/ground_guide_hand_signals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a992d3e-9158-43d0-a2f5-c8cbac9ec55e/tosunapufinatevubuve.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/0061/4040/files/jimirawavowovase.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2638/2500/files/download_novel_midnight_sun_bahasa_indonesia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1516/6357/files/cal_poly_football_practice_schedule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0023/3635/files/mosaicos_6th_edition.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_off00006d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D0E 5408 bytes
SHA-256: 2fb2dd2f389ce7ee6e34fa5a36a272b38071526c1a2eadccdbf71644eb9be8a8
font_01_sfnt_off00007f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7D 10156 bytes
SHA-256: c43e31d41cc8e03b0ffe7130ea669152eb90d179089ce426715470f806ba0ef1
font_02_sfnt_off0000a232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA232 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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