Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e7198a968499e4…

MALICIOUS

PDF

96.5 KB Created: 2020-11-03 00:56:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 85c50e2fedbac301579c776624fc5cdf SHA-1: bb090faff242a2feda09a678201830d09895f57b SHA-256: 66e7198a968499e4e87dcc6a9acd3cbba53efcf2408f9e74ad3103e9849d0aea
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 0.9999

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/strik?keyword=secret+service+jobs+age In 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/labitajaxatufib/52703826522.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/0613/5961/files/posix_threads_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/2882/9109/files/colony_hotel_palm_beach.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0629/4178/files/battle_warship_naval_blitz_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e05c75a7-5a59-4493-a800-ba3cf992c4eb/56814044719.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/sika_deer_maryland_record.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8d73cbd-8e14-47d0-acd8-f7ed0a6088a1/icivics_amendments_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/kukinoxupemufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82c9e62b-f217-48c0-8922-b08976cd8007/tutof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b16e35c-ecae-4864-bafb-b92148e9ee03/kefaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7261/3280/files/galliano_elementary_school.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_006_off00013888.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13888 27388 bytes
SHA-256: d29a4ebfde7898e4f9fc3193c1088d034766a39ef30a29309e935bbd2482fd43
font_00_sfnt_off00010080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10080 4996 bytes
SHA-256: 4a98b82278fad2d3f16e0bc7a673339cc81ab606de031fb337e013a8a880ddc9
font_01_sfnt_off00011194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11194 11340 bytes
SHA-256: 3c5ef3933462567cd71ae5c4ce308d020f27dc3d793eff865c5f6ae2e050763d
font_03_sfnt_off000166be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166BE 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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