Malicious PDF — malware analysis report

Static analysis result for SHA-256 e911a266c272b3aa…

MALICIOUS

PDF

51.9 KB Created: 2020-10-28 15:19:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d359b58f63bbe76b88723c23c455176d SHA-1: 2b3f123c8888f4afab944f8e20c917e94fbf06ca SHA-256: e911a266c272b3aa2a39a8c99cd696e99560500dba592d9e3b5e01bc32b964c1
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document functions as a link farm, embedding numerous URLs that redirect to various external sites, including a known malicious redirector. The document body text, though partially obfuscated, contains a URL that appears to be a lure for users seeking "statistics project proposal example" information. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL is a high-confidence indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.link/123?keyword=statistics+project+proposal+example In PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/linurigaruxox.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/7d3707d5d.pdfIn PDF document text
    • https://sesorefamasupuv.weebly.com/uploads/1/3/1/0/131071262/dc12ccc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369149/normal_5f8da1543166d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383573/normal_5f977f313c145.pdfIn PDF document text
    • https://senobatupubem.weebly.com/uploads/1/3/1/4/131437889/bb47d8b9b84a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376878/normal_5f9803b997bf1.pdfIn PDF document text
    • https://wojawafelufofux.weebly.com/uploads/1/3/0/8/130813934/tarofut-wotusoz-vexete-fasub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/free_biscuit_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/235546ce-1b32-4a64-bae7-59d2ba2952d5/50736223939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d09d0f5-a678-4622-94ff-27d9c30d89bc/20820268668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/386e6b7a-88b9-48cb-bf1b-bdc3c5804d28/rolimik.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/pidugusawuvuzibeve.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/10695994104.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4456/8216/files/blackout_contact_lenses_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1254b273-46d9-480c-a715-3f3b15a03466/57867750261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed1b28fa-351f-4e31-90ca-1de5b6920356/65430336009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b813ceb-1480-4be6-b969-d6dc3e6bf96b/nefidigiwagarinakar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5b6eaeb-1cc0-45b4-a276-2d8fbdf9bf37/68477147643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d7eced8-c9a0-4589-b7a5-7b7d6488a74a/95973026330.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5112/9278/files/27065233809.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0787/7017/files/zamevepag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b53e63d-7c10-4ca7-b430-59a5551a46ff/dafapitanaseleti.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7306 5324 bytes
SHA-256: 093306b943a9af23f949d4f9048ea2e96e65a7479b6aecf8dbf28df01c5713f1
font_01_sfnt_off00008514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8514 11516 bytes
SHA-256: a1a7f8f89f2b0f1b0778464b28b27ff4becfb8c8ffcc811e9dfa1f05c9b8b4f3
font_02_sfnt_off0000ac87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC87 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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