Malicious PDF — malware analysis report

Static analysis result for SHA-256 261d56a66cf9e6e2…

MALICIOUS

PDF

41.0 KB Created: 2020-11-02 18:57:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 17732d890f23e11278cc1ebe281381ff SHA-1: 175c070aaf0d5dcc57c0014f3077f655568221ae SHA-256: 261d56a66cf9e6e24da719eebedbe0a6238138b2c8698e8aa365bab4cc1fde69
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://ttraff.club/123?keyword=revolutionary+war+internet+scavenger+hunt In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417137/normal_5f9c90bb63262.pdfIn PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/duritewane_nebidafaxor.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://cdn.shopify.com/s/files/1/0465/8174/3783/files/74224532391.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/8463/6320/files/55341789072.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/1093/8797/files/40678191412.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9833/3092/files/aiwatch_xwatch_sport_smart_watch_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1eda36f-29ad-4e2d-b5dc-ad09cc654df3/65091824411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8de6a94-4a0d-41ad-8775-7b6710ef7e97/fibikinotu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/8526/4575/files/takozos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4685/7635/files/fixivudexamagosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84b482e1-4cfb-4c2a-a232-0d65a2358c23/lulapibakenudupaw.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_off000054e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54E4 5204 bytes
SHA-256: 49bcafd7547bc6f281d0e6f92c7482dd6da3bc67b63f05b46d32d819432cdaf6
font_01_sfnt_off000066b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66B3 10088 bytes
SHA-256: b59a18afd8d79bb42830ca1b51e66785ecde41c2516bf79a305b3ed35bd48684
font_02_sfnt_off0000893b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x893B 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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