Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2358761aaf49539…

MALICIOUS

PDF

34.7 KB Created: 2020-11-03 08:29:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b112c6df357985771a0d053f624532a6 SHA-1: 28232e9f6268548050ff04dd73c7c0806bb47024 SHA-256: a2358761aaf495391deb943d774970befeb40b08d9f23a89aec8c2d377e7ae41
124 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.cc/123?keyword=acid+bunny+unblocked+2 In PDF document text
    • https://pagofere.weebly.com/uploads/1/3/1/3/131398194/6167660.pdfIn PDF document text
    • https://pusojavinobaz.weebly.com/uploads/1/3/4/3/134353251/3869986.pdfIn PDF document text
    • https://vonolorijamitef.weebly.com/uploads/1/3/4/4/134452045/xomewafig.pdfIn PDF document text
    • https://fofupapezu.weebly.com/uploads/1/3/4/3/134356394/vusaguzutugu-tejemoxeja.pdfIn PDF document text
    • https://xibogunef.weebly.com/uploads/1/3/1/3/131398295/9bca9806b74.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/1/0482/0720/0408/files/sound_system_engineering.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/gorolusadunokafojinilen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/8214/3686/files/group_2_mains_syllabus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/2712/5188/files/11070274320.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6987/4082/files/saving_word_document_to_on_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/60369820425.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/napoleon_bonaparte_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9686d767-f1e4-47c8-b92a-608583b333ae/sunolikomavagafomibukup.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/baramati_taluka_map.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_off00004b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B40 4876 bytes
SHA-256: 002234418493ad4456fea4412e80262ec6de08db8e7f23a3d4d7d1166c09973e
font_01_sfnt_off00005bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BFA 10056 bytes
SHA-256: e8b108019d08c7e89d1ee7ed1e2a344d46d76e087089f5b82591e99710b87fa3

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