Malicious PDF — malware analysis report

Static analysis result for SHA-256 c954d16fd2ebd0e4…

MALICIOUS

PDF

54.0 KB Created: 2020-10-31 19:25:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a8d83522c15a59a4ee8e11ec92ff2223 SHA-1: 1fb8d36cab3872624ecaa75d96dc689fc68eb54f SHA-256: c954d16fd2ebd0e4189d63c9cb1b52bcbf0e8514f854ac6671315ecab3f28aea
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.com/123?keyword=week+33+pregnancy In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373519/normal_5f922a0f73d18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393901/normal_5f8eac4acdf71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391009/normal_5f8ef3e94152a.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://s3.amazonaws.com/toliwudalamem/ribizisolalenipu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3146/4616/files/download_sb_game_hacker_apk_uptodown.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9230/2752/files/rabbit_farming_in_kannada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ab023c8-750f-4bd6-9b99-0abb18187f8f/lego_star_wars_red_brick_locations.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/0437/7257/files/running_android_on_iphone_x.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/proyecto_de_biblioteca_escolar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0063/5290/files/mamunapat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9609/5397/files/summertime_saga_guide_fake_id.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/36590805068.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/rufovorub.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/amparo_davila_cuentos_reunidos.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_off000087ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87AC 4784 bytes
SHA-256: ef531ded0ea7663a83ffa847edb31cacde7a07dbd3e5a1591e832d499ebb87da
font_01_sfnt_off00009805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9805 10908 bytes
SHA-256: 6f65185d97de24b5b963f7b4ca611e5b0ae70b58ac05de105be7aa7c1b78459c
font_02_sfnt_off0000bd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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