Malicious PDF — malware analysis report

Static analysis result for SHA-256 413745539a6f78b6…

MALICIOUS

PDF

51.9 KB Created: 2020-10-10 16:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3542f345623b4564fe11d74e086166d2 SHA-1: 9745be3376817e69eb3031a812e21afdc4dbad88 SHA-256: 413745539a6f78b6e2f60a034053b37b80ea841822677eae562a1bb2917b2696
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to a malicious site via these links.

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://ggtraff.ru/strik?keyword=calculadora+de+incognitas In PDF document text
    • http://motiwo.sbednarski.net/uploads/1/3/1/3/131383914/rudaxefusugusadi.pdfIn PDF document text
    • http://files.tannerpestcontrol.com/uploads/1/3/1/0/131071145/donidepixuluxexo.pdfIn PDF document text
    • http://files.maplesyrupsupplystore.com/uploads/1/3/1/3/131384076/zilozilovizap.pdfIn PDF document text
    • http://files.aprilgentry-sutterfield.com/uploads/1/3/1/1/131164011/fuxupigovi-lumiwilin.pdfIn PDF document text
    • https://site-1039324.mozfiles.com/files/1039324/48759900055.pdfIn PDF document text
    • https://site-1036661.mozfiles.com/files/1036661/gobefosunafekipabozoxula.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/1/0435/1954/1416/files/worksheet_formula_writing_and_naming.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/9159/7214/files/iq_test_questions_answers_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7373/5330/files/mixed_bag_designs_outlet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1367/5928/files/do_cows_fart_a_lot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa849571-aa4c-4dfc-a1ac-69d01f77519b/zaxofewilofefikejilelopeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/498a374e-468b-4b4a-9a25-d2bda2bd0223/tawazopanew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baf080c7-7710-42e6-acf9-7887f0a4407b/gozadozorofi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cb6195b-a85e-454d-9815-adb9d7ed5fdf/77175313080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d84cde10-32a9-4620-950b-673bc3a5815a/nibopozelopugubewa.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64EE 5012 bytes
SHA-256: 1d1f9ae8bb9b87c426889cba364a3d900c598f2a5c3ade067e3fab50c76dec56
font_01_sfnt_off000075ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75FF 17792 bytes
SHA-256: 42efa23731798b9d10fef4fcabd55acaa79ad66878617e9245fc7a306206205d
font_02_sfnt_off0000aaf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAF7 16264 bytes
SHA-256: 2fc0d09e79a051746b8b5e348b447237ec71780d746b0684d5f69e02b7317785

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