Malicious PDF — malware analysis report

Static analysis result for SHA-256 274137bbaeb96f33…

MALICIOUS

PDF

33.8 KB Created: 2020-11-01 16:53:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8ac44738a821fcd2fad3edf24dfe15a9 SHA-1: 5313d9d892be697902a75b3b41931844fc0011bd SHA-256: 274137bbaeb96f33ee746a77733e7a3565378b5e3b4998aa5fb25a232365ef89
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains text referencing "Utube youtube kids download" and the malicious URL, suggesting a social engineering lure. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.com/123?keyword=utube+youtube+kids+download In PDF document text
    • https://fevixivosetakub.weebly.com/uploads/1/3/2/6/132681861/2558954.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/1/0496/3070/7865/files/kuch_rang_pyar_ke_aise_bhi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/6524/3311/files/holding_up_the_universe_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfa0a9a7-0e4f-4e03-9be6-faf3fcb53718/76473762973.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/2167/9771/files/jumia_online_shopping_app_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/imaginarium_marble_race_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/99234461407.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/072cbefd-cc1b-43ff-863b-36eff3db825a/83109212474.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/arms_building_workout.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7096e49a-c5b0-4e9c-8df2-26ae033a491a/80144371692.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/what_is_a_formal_region_in_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46ea1555-490f-4e44-ba5a-e50b09e8bec9/17282806429.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/audyt_energetyczny_domu.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_off0000482d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x482D 5112 bytes
SHA-256: 53c8ad21afaa5c3969df621f19447d991cab9dfcf5dfb8cdfe8ffab379c59acb
font_01_sfnt_off000059c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59C2 9520 bytes
SHA-256: 63a50507c772051be5366344ec618aa35a7374f62b8f97532161d3f6e36112d3