Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46fbca21ff4a1b3…

MALICIOUS

PDF

100.6 KB Created: 2020-10-27 13:01:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 12e07f2c8dbe295e15f9f2844d5b6317 SHA-1: 2d51ba89fbe6b9f1db9f4133c7ce2b13a37f62b4 SHA-256: b46fbca21ff4a1b38c5e268bfc71adccb97511925a26af3d7efb4d8caefb817a
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/strik?keyword=pmbok+guide+5th+edition+pdf+free+download+deutsch In PDF document text
    • https://pirizujimo.weebly.com/uploads/1/3/4/4/134454944/rululalakanipa.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/4041939.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382643/normal_5f8e717766ed0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392658/normal_5f8e371f533a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_5f91e5dec49ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/4646/1336/files/6901875771.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0775/1838/files/71729679349.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8668/3554/files/48299887271.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/la_sorcire_grabouilla_partition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8167/8494/files/mitsubishi_lancer_2020_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/bioethics_a_philosophical_introduction.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/55205685744.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/44381968385.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/reading_skills_ladder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2da365a4-428d-40e9-a5e3-5e9b6e7dae54/41213977960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/268dd045-f914-4856-86d9-ea8abf9da329/78717123430.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91145ed4-4067-4581-9795-34baed08b887/83372504618.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/lomanavivifogupaf.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/musoputelowilal.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/bible_study_book_of_job.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/wuxosotasoserisatata.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00015606.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15606 26356 bytes
SHA-256: 6a22a7d25c22e4d41b7c4dbec43149abf7ac719486673e03b08ac9d28f91f79d
font_00_sfnt_off00011a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5B 5988 bytes
SHA-256: d761dabb4da08a76f5f9f754edf6885e6bcc075fb1244786aaa5b74e0a553f44
font_01_sfnt_off00012ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA8 12364 bytes
SHA-256: de5107cdec323d540ff0d43df1bb6154f37ff9946ef18bda0bbe07a950bdd268

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