Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86893faa57fb975…

MALICIOUS

PDF

57.5 KB Created: 2020-10-31 19:59:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 05368c5c33871560e832f6925163d121 SHA-1: 28ac201452c2f28fbb434c8d313bed7efa4ea75a SHA-256: d86893faa57fb97550429127b99e197e97974ffe0cea3af084d6d13a3b423564
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/strik?keyword=gta+sa+ps2+superman+cheat In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_5f8bb590a3387.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/1/0502/5516/7668/files/bile_duct_injury_management_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/5.3_human_population_growth_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5935/5041/files/33781975043.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/brief_summary_of_the_bible_from_genesis_to_revelation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8963/4483/files/marshall_major_iii_bt_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/best_english_arabic_dictionary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a384cab2-6ac4-42ce-ba71-3e87d7c4010b/43304085225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/027016ee-1593-4312-a794-ed5830a9fc22/olivier_blanchard_macroeconomics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6134/4406/files/86287411034.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/2812/3295/files/2475629932.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/satepikegedaxumupesuzi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/1382/4422/files/68331782690.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/dnd_5e_character_sheet_editable.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_off0000a35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA35D 5304 bytes
SHA-256: 6cb95f3dffea3a5e0357b1bcd56dc87a12c40eb564c26bbc6e9f8b4a97e8c1db
font_01_sfnt_off0000b541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB541 10672 bytes
SHA-256: 38c22348ceaef73c8d4a8d3721bd42d95c9ce881e3b560ee487d9e885dd0f240

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