Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdf9d9a4a6a46d7…

MALICIOUS

PDF

40.2 KB Created: 2020-11-03 21:59:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d4821a109f80f56a9b0e01c1ffc9ffca SHA-1: b97e4b7165f29d156d24263a17bb114f5b613c53 SHA-256: dbdf9d9a4a6a46d72de6fc2586ccd3b0eabfb3eddabbe4b8c0e8245eaec926dd
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, identified as a link farm, with a critical heuristic firing for a malicious redirector. The primary URL leads to a known malicious redirector, suggesting an attempt to drive traffic to malicious infrastructure. While no scripts were extracted, the PDF structure and embedded links strongly indicate a malicious intent to redirect users. The ML classifier also flagged this PDF with high confidence.

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://ttraff.me/123?keyword=economic+liberalism+ap+euro In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376127/normal_5f94b34988058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_5f9154030165d.pdfIn PDF document text
    • https://ximazula.weebly.com/uploads/1/3/0/7/130738777/tazerapopizosiroki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374376/normal_5f8f5646ed237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405467/normal_5f958d40339cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384461/normal_5f91a07ea9b8f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/48bd1616-a64b-4725-a92c-c9c71fe7f574/43615983736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc77f243-fdb8-4274-a629-3c4d38bd9076/table_tennis_games_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/ps4_gift_card_codes_free_unused.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/analyzing_the_declaration_of_independence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a47cc5c-4198-4f0a-8d86-b91d33d04197/xoteba.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/lidaraberutewebepuj.pdfIn PDF document text
    • https://s3.amazonaws.com/sodoxi/jbl_horizon_service_manual.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_off00005efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFB 5176 bytes
SHA-256: 78430cc387c2ce0151233d5ed072d5a369d728482b8e16c149359c8559ccbc9d
font_01_sfnt_off00007080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7080 10520 bytes
SHA-256: 5cb7d6c7b5d0dd0db5ea7a823b540544c7bbc9911f736b451ffe72b04706bc2c

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