Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a126b7bf5e41be…

MALICIOUS

PDF

38.3 KB Created: 2020-11-02 07:00:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 36e509753a818b807755730eed0e21d2 SHA-1: e7f5f83f6048b1d280d4ea8cc5e7e1364235b122 SHA-256: f8a126b7bf5e41be2cec7e2140889cc69069501555e4f3bea20da6347e6538b7
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to a known malicious redirector, which is also present in the document body. The document also contains a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. The primary malicious URL is a redirector that likely leads to further malicious content.

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/aws?keyword=phase+change+diagrams+chemistry+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376879/normal_5f8c4d76c7a43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374957/normal_5f8cbc5c0b66f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387241/normal_5f94f88325563.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/442a2313-5fc4-41f4-85a1-e21157f5fec5/sokugobowef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a01d4bd9-5fcf-4297-86a5-494396a73d7f/14592634544.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/5618/2470/files/wanejibabodurafupi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3315/0118/files/hemangioma_hepatico_pediatria.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/4798/2521/files/kufiwefegijepefev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9468/0764/files/aashto_m249_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/614ff062-725b-4c80-bbd3-7906076e3d23/zipuvexapa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1570/7030/files/fiscal_en_ingles_que_significa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07992bfc-f125-42e8-8441-35342552de0c/no_mans_sky_terrain_manipulator_con.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d0f49f1-f2e8-497e-a558-2b0cc3d6c837/les_res_gologiques_dans_l_ordre_chronologique.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/4246/2618/files/gisoxejiputajukurekasuri.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8400/8603/files/jointed_teddy_bear_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/3084/5853/files/6430252287.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_off000057dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57DD 5580 bytes
SHA-256: 2f37845da2efbf53f41ebd514fd246bf405811d09e3ff9596b1b6c02f40379c9
font_01_sfnt_off00006abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ABB 9808 bytes
SHA-256: 8d86ccf71fd6096443f5dbf9d1d6bf51c4aef50ba31b2bb8274c1d796261f8ef

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