Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc7f68fe7e408bc…

MALICIOUS

PDF

42.6 KB Created: 2020-11-03 01:16:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 51dd296526aa917e3241bfe1488d39f0 SHA-1: 1f85cecc6cfcc18bcdcf67bd24ebb8447e8b00eb SHA-256: adc7f68fe7e408bc2fdc08c49c6d97365d341eb317299549d04531401bd65171
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://ggtraff.ru/aws?keyword=king+of+thieves+hack+apk+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387817/normal_5f8d07035c93c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5fa08c25b389e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375698/normal_5f93c94c758a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410416/normal_5f93422a89bad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368266/normal_5f878b630e4e1.pdfIn PDF document text
    • https://tunomofezu.weebly.com/uploads/1/3/2/3/132303147/4571698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381766/normal_5f96d22927a5e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9204/1624/files/eastside_high_school_gainesville_fl_bell_schedule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9195/4331/files/maltipoo_puppies_for_sale_sf_bay_area.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25a927a4-73da-41ab-a5c1-44d8c4c00692/gonuvuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cbda602-b0cb-4566-bebf-6e8f5932ae0f/lezudejivuwogul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/271b0a66-9966-4fce-b3ca-4e7d10d9f895/low_carb_mediterranean_diet_food_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78cde829-63af-4d35-a79b-1e15b3a4ce5b/edcd_waiver_provider_manual.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_off0000681e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x681E 5508 bytes
SHA-256: 7c59e7cc7ce9b31ca65f445f1c4c2c61fc42d8b1644fa866e3aaf09956901163
font_01_sfnt_off00007aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFF 10008 bytes
SHA-256: 1f040efce1f6d1d6b0385f084e5f493e484e6f60e059ef7c3b9d4d2c03615e61

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