Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47c820260b7eb77…

MALICIOUS

PDF

35.9 KB Created: 2020-10-18 01:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2166303979cadc82d9e6a9c0835e3af9 SHA-1: 30ba011e6ab0e2f812aa49cf41a4cc570fdb3f69 SHA-256: a47c820260b7eb77c82647f6c84b7e3336de08a2f75d5cd23ee7af701d4e3ff1
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, disguised as a chemistry textbook. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document instructs the user to install or connect with a remote-support tool, which is a high-risk action in an unsolicited document. The ML classifier also flagged this PDF with high confidence.

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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://ggtraff.ru/strik?keyword=chemistry+atoms+first+3rd+edition+pdf In PDF document text
    • https://risimukino.weebly.com/uploads/1/3/1/3/131383953/dalud.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/bagezusurebimu.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/porukofosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5f87029d81f10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370073/normal_5f8941e0d161d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/6031/2232/files/fosigosefodaxufojos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/1979/2294/files/53268014665.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1291/4332/files/gudoxoxejuwolosagaxiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0240/3750/files/5-2_the_structure_of_the_brain_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6996/7013/files/wechat_application_download_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5968a2e4-6082-4d31-8212-c76f9178a871/2791592419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33915a14-d0e0-4f70-9bc8-ed6a1031ef2d/legupasukadapaxuxevom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abac98d8-4907-4813-a6ed-2accaf650925/61491994823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aa6ef97-bf63-45d2-b0b2-c7b9f9f9c4a7/penudipepeletewetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f189aeb-755b-4972-b2b8-61fccd673207/jupizadusuderoliwologe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dae402e-3fdb-4235-8813-f7aa5fd8ed76/dategisazel.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_off00004f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F87 5420 bytes
SHA-256: bbe4e104fc7d41d6d79ac98059c5daae372d576fa5ac373014f48eb41edebc23
font_01_sfnt_off000061ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61CE 9640 bytes
SHA-256: 6369bc8127bc8dcf529118e8b3f3c1b64e1766eea23c2f50757d653eb993bc92

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