Malicious PDF — malware analysis report

Static analysis result for SHA-256 496100566a2d6add…

MALICIOUS

PDF

45.1 KB Created: 2020-11-02 08:43:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 93bf554064944c20a0a9339378fccdf4 SHA-1: 20930af57652794fff4a59d6fe256ca73e4fb993 SHA-256: 496100566a2d6add1bc84d550aa96db4233dd3738dc15a3c42661e619d969ddf
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=evaluate+exponential+functions+worksheet+kuta In 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/1/0477/0119/6966/files/leawo_blu-ray_creator_v8.0.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9249/5521/files/c1_sequences_and_series_worksheet_d.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/hernia_abdominal_perros.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/new_dmrc_metro_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d8b4021-49da-49a4-9f7d-73629eb4b123/nabamatebugedenofutipogix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/0244/1124/files/89360587782.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/9214/7869/files/dudozibixabuvatalugo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1859/8558/files/wanted_dead_or_alive_tabs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/0677/1356/files/dd_planescape_campaign_setting.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/tata_sky_packages_list_2019.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D59 5224 bytes
SHA-256: df4c0b62978b01c457ab9fb22da127cfab689c77bddd6672da5a3f336b076e59
font_01_sfnt_off00005f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F30 10816 bytes
SHA-256: 9fb0633190a13ff5ed258304d6c70e9b10989e6be285bd23897082e2f49f5b9f
font_02_sfnt_off00008425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8425 16116 bytes
SHA-256: ca477abbde1f042901888e41373aca9eed9e8f5321db3733fc72d74c516540df
font_03_sfnt_off0000990c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x990C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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