Malicious PDF — malware analysis report

Static analysis result for SHA-256 d226be8ccfcbe34f…

MALICIOUS

PDF

44.1 KB Created: 2020-10-29 02:00:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0a191c1a2eb7b199ba5c8fe961e4afd3 SHA-1: d92f1a2ba7f92ff30d4ed8717109f14e58fe6e93 SHA-256: d226be8ccfcbe34f9fb22ee7a714735c5ce560f4869d54fe02bc032006cb3952
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=blue+buffalo+dog+food+puppy+large+breed In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369189/normal_5f8c601874706.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411231/normal_5f94a6f6c2d61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380072/normal_5f922865bae9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381735/normal_5f8ce89889ae6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376612/normal_5f8e773b61979.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://cdn.shopify.com/s/files/1/0432/2361/3595/files/pro_evolution_soccer_2020_android_game.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4158/6332/files/bufekaviwedudowunilere.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/0255/0174/files/fafawenakamopevupobaka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/2882/8319/files/graduate_survival_guide_review.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5978/1023/files/74710033768.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/0147/6758/files/63396556855.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5043/4211/files/40921152793.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/1328/2213/files/descargar_whatsapp_extremo_2020_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/9173/6741/files/trevor_noah_afraid_of_the_dark_rotten_tomatoes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0990/0183/files/71235800430.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7296/1688/files/capitec_job_application_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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60AE 4968 bytes
SHA-256: 1f4ffbb7cf66b57217777b2bd39b5600a4be0798c47fe771aa0c7160d556d660
font_01_sfnt_off000071b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71B1 10328 bytes
SHA-256: a8ba93fbae4eebe2ecb7b442ad81bb55bfb1519946a79553d9fd28be4d34ba41
font_02_sfnt_off000094eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94EB 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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