Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04186bed966e727…

MALICIOUS

PDF

98.2 KB Created: 2020-11-08 02:23:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f23e2a04f900b61abd2a0551fb2e9102 SHA-1: 12d953324d6faeda542005baca4c2a3d3b69fca2 SHA-256: a04186bed966e727765db1f0b9cd3f971a42e2f905c6526cc1108809a9f2281d
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 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=the+republican+era+in+china In PDF document text
    • https://jusujonolixutuw.weebly.com/uploads/1/3/1/3/131379247/fd22000b11f107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386335/normal_5f9555e0560fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383797/normal_5f9f03129d499.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f87032e1e621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427313/normal_5fa18e68b387b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380083/normal_5f9155572b3ed.pdfIn PDF document text
    • https://mogijoduvide.weebly.com/uploads/1/3/0/8/130814471/dutatixur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5f8c894e98172.pdfIn PDF document text
    • https://xidawelopumez.weebly.com/uploads/1/3/4/4/134439163/08b58.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c51f1011-a416-42bd-936d-e4bf37fc8a79/bipifoni.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/ansys_spaceclaim_2016_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/lenasenalimumasamez.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/37962956426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fc2b3ca-c918-4e35-a83c-4c2971ec178b/7204199301.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_off000109d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D0 18344 bytes
SHA-256: 034e8f7e2fb66c46767c42ddb3ded515f149e0691a136e6981189661fc74ee05
font_01_sfnt_off0001438d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1438D 4932 bytes
SHA-256: 773a0309bcdea85dc908c018495b08acc28e3f66b030710a91167230f347cd94
font_02_sfnt_off00015446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15446 11712 bytes
SHA-256: a5284c21d88e85686171018d20ce2f95d313549fc5395e3f2dff526bcb3a637e

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