Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ab0a40209a5e4f…

MALICIOUS

PDF

84.3 KB Created: 2020-10-19 09:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 615e229d45ff593f48afa128919d3e6f SHA-1: efccd9aef248507072c869da05342baf5fbbfdb7 SHA-256: 17ab0a40209a5e4fc2d5118d79f618df45dfa5ee3ec3ea0a75d0921cdb2dfc2e
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious domains and are likely part of a link farm or redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' strongly indicate malicious intent, aiming to redirect users to potentially harmful content. 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://cctraff.ru/123?keyword=godinho+delgado+direito+do+trabalho+pdf In PDF document text
    • https://wonigebegi.weebly.com/uploads/1/3/1/6/131606731/xolube.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/4045700.pdfIn PDF document text
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/afb317b1cced83.pdfIn PDF document text
    • https://nikuwexipamojag.weebly.com/uploads/1/3/0/8/130813731/9386871.pdfIn PDF document text
    • https://mogijoduvide.weebly.com/uploads/1/3/0/8/130814471/9968283.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/88676607-8869-4c25-b294-bf7c059de53e/monipepexepakub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f692881f-0832-43b3-a50d-407bebc94d1f/gotobide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88b00b08-7eec-4106-ae35-f822749d365f/jowapenabumabewiwuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f22fb98-56cb-44f5-9495-dfb0e2603ab3/19968552620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc90a3a8-416e-452a-9691-1a5b22e1d12a/86709334398.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1322/6143/files/jozesunekufiduxuvilu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9472/1187/files/this_boys_life_tobias_wolff_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbe79caa-941d-48a4-ab98-a39236ca49f6/bebiwirowexununozupebima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b5ff242-6222-4e40-92c4-ecbe02a73ec8/dadokisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97438f54-b91f-421a-b8a7-540921f15645/fogerazodidijar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2439/8528/files/tommy_hilfiger_ladies_size_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3768/5920/files/bugatokozoxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3121/5774/files/wuzuturefemo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8924/1258/files/moss_middle_school.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC13 5084 bytes
SHA-256: fc161a26060b78f98433efd73840f218d13cb46e5ff315c37bddfa956ffb51fe
font_01_sfnt_off0000fd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4D 19340 bytes
SHA-256: b7742ac5439e89c5546221ee2dcca0903ab84337fac564391dbe17056a23900e
font_02_sfnt_off000133dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DD 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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