Malicious PDF — malware analysis report

Static analysis result for SHA-256 4003ec46b1319c96…

MALICIOUS

PDF

41.8 KB Created: 2020-10-25 22:21:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 738260712e5822305e340316af0fd029 SHA-1: 24ff9c5ff6bf5dcd576edd95dd35925d5133b48d SHA-256: 4003ec46b1319c96d7403982e2c19bc8d11624aab1ebcda679f58235cdd4a096
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one identified as a malicious redirector, disguised as an ebook download. The ML classifier strongly indicated maliciousness, and the presence of a redirector suggests an attempt to lead the user to a malicious site. The document body and metadata indicate it was generated by wkhtmltopdf, a tool often used to create SEO spam or phishing documents.

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.com/123?keyword=online+ebook+pdf+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4404514/normal_5f9578ef7742c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386365/normal_5f8ff9c0614e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374371/normal_5f8b3bcaaac0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370285/normal_5f8ca570ba496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403540/normal_5f915ffbf20b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416490/normal_5f94ea36e1746.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/1/0484/6898/3969/files/compound_sentence_worksheet_for_grade_4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1578/2048/files/jungling_guide_arena_of_valor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9484/4585/files/1230275090.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/2209/3983/files/stretching_anatomy_second_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1861/6473/files/keto_flux_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8255ad0-783b-4253-a325-c8933ddb6cc6/xiwujuzefolujawutopope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8551a330-abf7-4d0e-b2fc-015bea7af224/500_kw_rC3BCzgar_tC3BCrbini_fiyatlarC4B1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77571bbf-0e81-4bbe-a422-c634e8dd2a0c/natag.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/pdf_annotation_tool.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/6th_grade_math_bell_ringers.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/tuvakumel.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_off00006540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6540 5084 bytes
SHA-256: c51254c95c367808ca83008e71e58e1b91b4d9ed106910478439dc9ac5c42da4
font_01_sfnt_off000076b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76B2 10504 bytes
SHA-256: ba133f6dbf06fd2eeeac0ad4a1ecb3d164cd9873f36d7944178022ac29fda975

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