Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67f07db8baecab2…

MALICIOUS

PDF

54.8 KB Created: 2020-10-29 19:09:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a4226e118da78757ba9d9cf7c01e6afa SHA-1: d66d85db7a530b9f152e6c6e51813f4a08fce5e1 SHA-256: a67f07db8baecab237c08fa1cd0736db31a81bbc4a03daf562a44219961fcfca
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/aws?keyword=wood+burning+stove+fan+uk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375886/normal_5f98c20d55758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417139/normal_5f9897942cbd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_5f8e7979a4f4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5f877c893a07d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367674/normal_5f8779ac8bd5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_5f891df7858d6.pdfIn PDF document text
    • https://doxorovovo.weebly.com/uploads/1/3/4/4/134479089/3519087.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/jivuxo/islamic_center_of_cleveland_prayer_times.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dce64f9-5fc9-4c34-a817-73531433d8f4/benosubomiwiruvufisomare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4104782a-74bc-4689-9783-1cdcad986ac4/65075249671.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/46590345750.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/celestamine_xarope_bula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7298aac-b6de-4780-bc4d-f32e515d2eb8/56423983348.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/blue_cross_blue_shield_of_michigan_prior_authorization_form.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000811d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x811D 5320 bytes
SHA-256: e393518e54d04b87f9cb9929fecd32c009288fcdc6f54ca35d17c6e5ebfd5deb
font_01_sfnt_off0000935c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x935C 10980 bytes
SHA-256: 29fd72d047bb2f2a63a50cf1b4644c4a007ef640af664e45c57cc49606cf520a
font_02_sfnt_off0000b8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DF 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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