Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2af2af27ca925bf…

MALICIOUS

PDF

61.6 KB Created: 2020-11-02 04:18:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: edba8fc83d099807f82a2f180b4a39e6 SHA-1: 2e1a9d242d0dae87ab985c2622fea1df5d059247 SHA-256: f2af2af27ca925bf2e8c433e1c8529dc63a854531a5a6e99c2386331fc7b15f0
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://gettraff.ru/123?keyword=snarry+mpreg+fanfiction In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/zepananimipapotor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2b5a192-05c6-4987-a62d-1f4a1ed880de/cristian_contreras_radovic_e_angela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4b2d42c-7286-4a41-b5b7-7fc89e893170/83016763239.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5676f1af-3fe4-481a-9971-7e929ab75dba/rpg_maker_vx_ace_item_icons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b54bb444-9ca2-4b85-bd6f-03a2ee08c8ba/nanakibuganazusejixuzavom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/809a84f6-598e-4dfd-90c9-2e887e37a9ae/descargar_core_pride_uverworld_mp3.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/aula_4_curso_de_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/33802515425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b299654-85aa-4ef4-92a9-bef68ac2d720/kavewamarevulaxokesit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8403/1162/files/cave_of_forgotten_isle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6121/4877/files/cat_ninja_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3872/7589/files/bill_nye_inventions_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6573/6855/files/22172056655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfe50449-daf6-4514-86c8-46c433d58b6c/numejoz.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000c8ea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC8EA 19492 bytes
SHA-256: 783d3c430add584ee6bdb045054c865a9baa8c74733908c338b4a1f9d8165247
font_00_sfnt_off00007265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7265 9992 bytes
SHA-256: aa492a4990a553f69ec8e265bc3a56492123f47b00e3c560cf5c3d0b7c743c60
font_01_sfnt_off00009307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9307 5332 bytes
SHA-256: d6a8d151ad8e8cdf082404407aa170c9b0f3a5e1ba8f4bd219f721a8422c10b3
font_02_sfnt_off0000a525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA525 10528 bytes
SHA-256: c4c436cced9e6890b8a5b56b32aa90ab18d7ab0ca62d165e6b470f07afd08b44

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