Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9eddc63690af6b3…

MALICIOUS

PDF

43.6 KB Created: 2020-11-01 20:50:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2e0697948e2fac5309d7fe5e6cf537a0 SHA-1: 3d2492d6446b6232397695641b9a20845b24930a SHA-256: e9eddc63690af6b35ccdd831dffaa9deae27db8184f52eb84101deafb9f96331
132 Risk Score

Malware Insights

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

The PDF contains embedded URLs and a visual "download" button, strongly suggesting a lure to download external content. The critical heuristic firing indicates that the document links to known malicious redirector infrastructure, specifically pointing to a URL designed to facilitate the download of APKs. The document body also contains the URL 'https://ttraff.com/123?keyword=apk+download+aptoide', reinforcing the download lure.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=apk+download+aptoide In PDF document text
    • https://kusebedanosude.weebly.com/uploads/1/3/1/1/131163667/3909083.pdfIn PDF document text
    • https://zoseruvabu.weebly.com/uploads/1/3/4/4/134492528/e964214b.pdfIn PDF document text
    • https://dopikilazobowu.weebly.com/uploads/1/3/4/4/134488506/taxaxus.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/8562847.pdfIn PDF document text
    • https://vepazigomopu.weebly.com/uploads/1/3/4/3/134398405/fatiwopilovapudo.pdfIn PDF document text
    • https://dojudiwoju.weebly.com/uploads/1/3/1/4/131406456/gedagaboguvi_kofuwef.pdfIn PDF document text
    • https://bojamaluzide.weebly.com/uploads/1/3/4/2/134265872/8ab741692bab20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370268/normal_5f9c140c6a2eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386091/normal_5f9421c21542b.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/fibesezati/adobe_premiere_elements_13_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/183ba9e3-ecf6-4b12-b390-0f4b5ab576ef/vojekejuxisariraxod.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/employee_attendance_system.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/ontology_and_epistemology_in_qualitative_research.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0508/5518/2510/files/hp_7520_printer_ink_cartridges.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_off00006b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B1D 4824 bytes
SHA-256: 1a9c4ad54d889a8611d9d625298744f9558027c489e904ca86f1e13ce5693bfa
font_01_sfnt_off00007bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB1 11160 bytes
SHA-256: 3afa7d4c033619d0d99fbc8f8d2c971b38aaa2547f0b224384e56c55083959ef

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