Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5a45ecf2e9f5c9…

MALICIOUS

PDF

69.9 KB Created: 2020-11-30 07:21:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d93fc99f891c74956abe857230c4b4ca SHA-1: b9f2cb7592abd894bdfa808924db9a31599de54e SHA-256: 1b5a45ecf2e9f5c914649a5dd495d147eecbbdbda374869c6781aed8a80e4d6b
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=download+chaos+rings+omega+apk+%252B+data In PDF document text
    • https://pobezewimo.weebly.com/uploads/1/3/2/6/132681951/4111191.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444853/normal_5fc42562ea4f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415782/normal_5f9edb706a822.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367687/normal_5f962c5421bd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477655/normal_5fa84e08dc7b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369143/normal_5f8819e8984a7.pdfIn PDF document text
    • https://logekififej.weebly.com/uploads/1/3/4/5/134502341/zoropon.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/takurugilij/juritojolefelubipel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fadb8413-17a2-4832-ad30-94765a52d3fd/computing_gross_pay_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/luramalabevenezefaxisosap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4538b70c-ad34-45c7-9bc3-46351d05abdf/double_homework_episode_12_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79f62e2d-9886-4d78-a8db-0c4a47e238aa/26760869570.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_off0000c7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AB 2900 bytes
SHA-256: b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df
font_01_sfnt_off0000d1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EE 5644 bytes
SHA-256: e4fe40cf8a1a6fd3e8ad1aa641861fa9ce67e3090c12e3dd82a98be46f7f2397
font_02_sfnt_off0000e50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50C 11004 bytes
SHA-256: 4646bcc6aed9c627a971dd0f45f16dc1a5c665a7979af185b7e9ff80af3b2f39

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