Malicious PDF — malware analysis report

Static analysis result for SHA-256 a409f61fa257fe14…

MALICIOUS

PDF

47.8 KB Created: 2020-10-31 09:44:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6ef4402a5847767140d921626d4fead0 SHA-1: d79d9f4902654bb0ba1e24687b2f8584ea1e9c97 SHA-256: a409f61fa257fe14ec890ddd75a2f908600bd2352a66c3447316625d2c9abe10
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=lego+star+wars+3+cheats In PDF document text
    • https://tatunonomufobuf.weebly.com/uploads/1/3/4/3/134355176/256982.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/rekin_vesawevegona.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/subud/fill_in_the_blanks_with_suitable_articles.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4169/9478/files/argumentative_article_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65e496f0-1975-4f2e-ac04-87dabced6fee/nebinasinedozumenigavi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4996/5985/files/9221767115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c03f11f1-834f-4298-a448-0870fbd6f90d/dovarenavejerul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a5b52df-1f6e-41b6-8226-d16210a30725/7818919401.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85b8ec47-2885-4d0b-aabc-471723091402/gifijujubuvuxafaxofarola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01f26f86-7db3-4b23-b62c-cdfc4225a209/wiwowewevebizaxipozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e1b0780-64ad-44f0-98f8-079711c3b2ce/vufipijigojewomaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/734ae615-194c-47ce-a747-e6fc51518a41/60571451747.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_off00006d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D59 4860 bytes
SHA-256: 03f0f5692a831b33d645032e99c0dd940a89a3654d98d8d3a4bd902c867e85e1
font_01_sfnt_off00007e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E07 11496 bytes
SHA-256: 6d3918601c96a7f80557dde659e92032ecafb3930c746e4390c5b67d3083a528
font_02_sfnt_off0000a484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA484 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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