Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fb50af97079d26…

MALICIOUS

PDF

44.7 KB Created: 2020-10-26 04:09:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e9de1ce987a094902131251b40e805ae SHA-1: 15c21107dfa1d40be612f85892564a384da59845 SHA-256: 81fb50af97079d26f768d5fc6ae43648716cafa00b9fce53830845f814361314
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a high number of embedded links, many of which point to benign resources, but one critical link directs to known malicious redirector infrastructure. The document's apparent purpose is to act as a link farm, potentially for SEO manipulation or to distribute malicious content via the redirector. While no scripts were explicitly extracted, the PDF structure and the presence of embedded links suggest a potential for malicious JavaScript execution if exploited.

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=reading+directions+worksheet+pdf 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/fofeguj/death_of_a_salesman_online_book.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/amino_acids.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/medical_tourism_report.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/autonics_mt4w_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7777/7061/files/h_p_lovecraft_stories.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3683/3954/files/bumblestripe_and_rosepetal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9425/4764/files/nulunerinekaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9651/4461/files/taotronics_scanner_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/8448/9145/files/kezoteteboxuwifi.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/8_week_cutting_diet_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/the_pardoner_s_tale_translation.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/are_you_smarter_than_a_5th_grader_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a205d2f6-f70e-4f92-922f-c08e1b14ecab/73074327157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/334e215d-2bba-4451-9b10-9366123f77ed/jipoxodofaterediwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b2ddaf5-3fa8-4d4f-a751-ccd5739748a8/26237064311.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7201/1931/files/vampire_academy_livre_3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7790/1214/files/members_only_vol_4_album_mp3_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8393/2582/files/another_word_for_secure_position.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/6703/8613/files/farmacologia_rang_dale_ita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d47ae110-6277-484e-b6f8-d5a00c892064/60200640755.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/639f1bd1-49ed-455c-9e6c-678524b95d1d/defomulepoxudixabo.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_off00006e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E46 5548 bytes
SHA-256: ae7d1b892521d35c367f4db7d311cd48c9e2a6b4c1fef19087d2e5b37d263359
font_01_sfnt_off00008132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8132 10612 bytes
SHA-256: 34f29e2759cb93a09c6fe58f95a5c210ed27dde8a42902ba4fc7e0adad151efe

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