Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40571e70166cc96…

MALICIOUS

PDF

45.3 KB Created: 2020-10-30 12:32:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 32ea6d29f21819edec4d821e568ad2de SHA-1: e3a6c0c7df554117130ae1cccacf9398fec7dbc5 SHA-256: a40571e70166cc96d2771eec86da883f0b6c6c1edde4dbaad0fa6b878092ebc4
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that point to a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains the primary malicious URL, suggesting a lure to external malicious infrastructure.

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://ggtraff.ru/strik?keyword=nations+ford+high+school+calendar In PDF document text
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/fagojowetedo.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/4a4b9239-20aa-479b-a1b5-aa99cead0f87/18113560808.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6553/6412/files/trials_frontier_mod_apk_6.9.0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceaee688-972c-4f05-95c7-3a3eb0153e35/paboxefazopufuwedidamo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/198d6298-0b3b-4f59-8748-d6a1b22bb2a7/arm_s_reach_mini_arc_co_sleeper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4de89f25-9a83-4500-97b8-1ead9f4ee291/nibosakusefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec447ce6-0d2c-4abd-9ae9-0de5600213c1/the_magicians_nephew_study_guide_an.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f5ca471-795b-4278-b5d0-fd7cca2a74d5/nujugatoziwamekif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d15fd51f-a9a2-40d7-80bd-1d621f628efd/lomoxivefarerovixetet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c802a5c-b9fb-4ab0-83b6-88f7add513a5/25216421019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d714a2b8-8928-4720-a223-6c6e0be7118e/deleberevuzinujetudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87e0e200-2253-4e5d-8224-da8009995555/69426916733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c95586e-ec20-4149-946a-d7919533457f/sinonimos_e_antonimos_concursos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2722/7036/files/tresendar_manor_description.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_off0000662c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x662C 5040 bytes
SHA-256: 4e282da9f6c7393749d66dc69798e40f23a1a26ad597105c07dbcafc14477078
font_01_sfnt_off00007743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7743 10368 bytes
SHA-256: 526157f7f685aca4519e0d3ad46c3146048bbc1e62a939d939a1948b7b6046a7
font_02_sfnt_off00009a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A3F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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