Malicious PDF — malware analysis report

Static analysis result for SHA-256 76db30e3491c8bec…

MALICIOUS

PDF

46.0 KB Created: 2020-10-26 03:32:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a587a653dc1dbe1b357822af19713189 SHA-1: c28c053f7e5e81603bdbba9a613f374c93af34c4 SHA-256: 76db30e3491c8bec552d6cb9b8d4ce3d488905bd0766bdf951dc52326f2ffce8
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The heuristic 'PDF_SEO_LINK_FARM' further suggests a large number of outbound links, many of which are to PDFs hosted on S3, likely for SEO manipulation or to obscure the malicious destination. The ML classifier strongly flagged this PDF as malicious.

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=our+discovery+island+2+test+book+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_5f87798d3126a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376611/normal_5f91eb8c9c870.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/subud/45819715906.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/temer.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/woburefekawularepujopiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1f5e160-175f-4a6c-adf4-423f1a08641b/71933967255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6770abe1-680a-4e9a-a830-e709508fc23b/ethicon_knot_tying_board.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/realismo_juridico_genoves.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/busadugojisijevoko.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/kipefadojubixis.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/14175868795.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/aarti_sangrah_in_hindi_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/63839641315.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/cause_and_effect_language.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/descargar_libro_de_cero_a_uno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8445/5330/files/47423348977.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2876/0741/files/six_memos_for_the_next_millennium.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/2092/6107/files/mercruiser_engine_oil_25w_40.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/6050/1921/files/phases_of_meiosis_worksheet_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9313/1425/files/63997418348.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A22 5672 bytes
SHA-256: 651cc62c9f745d39fe371ba7b3f7f598954b4a1b72abe6d5115a2dfb1ccb3a78
font_01_sfnt_off00006d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D89 12088 bytes
SHA-256: e9688d8a8b4f905741aa83be12625b68172e99cf738cd4f97e7e34490d299fff
font_02_sfnt_off00009547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9547 16144 bytes
SHA-256: f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d

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