Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee7f8bd87b05831e…

MALICIOUS

PDF

45.1 KB Created: 2020-10-04 17:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4f5a2fd39a6ce2e463699511ef30c46c SHA-1: f8d6ebe2e52db9a7db3ed537893f89c03d300119 SHA-256: ee7f8bd87b05831e46a409422d055fcfd1d5feccc87621c7e981b9f4f6bad8e7
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a coffee machine manual. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector is likely spearphishing attachment, leading to user interaction with the malicious link.

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://cctraff.ru/strik?keyword=ambiano+coffee+capsule+machine+manual In PDF document text
    • http://kasinesiw.colemanfamilyreunion.com/uploads/1/3/0/9/130969915/xefupefipa_laluvaven_tujavedukufagib.pdfIn PDF document text
    • http://ledojaf.michaelbaumstudio.com/uploads/1/3/0/8/130874496/tavus-dudupufif-bimalubuw-zezasaxerilajuf.pdfIn PDF document text
    • http://dexuvonem.projbridge.org/uploads/1/3/0/7/130775470/zazusekodipe.pdfIn PDF document text
    • http://masomeso.schrockhampshires.com/uploads/1/3/0/7/130775880/4c4ab60961.pdfIn PDF document text
    • http://files.nadinedarling.com/uploads/1/3/0/8/130873923/78c312bf.pdfIn PDF document text
    • https://site-1039525.mozfiles.com/files/1039525/98204117601.pdfIn PDF document text
    • https://site-1037129.mozfiles.com/files/1037129/buwireji.pdfIn PDF document text
    • https://site-1042733.mozfiles.com/files/1042733/35301431590.pdfIn PDF document text
    • https://site-1037260.mozfiles.com/files/1037260/durelaran.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/06a80eb6-8c14-4967-afb4-10d2d58c1256/lemojew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66e3b76c-3cd4-40a1-96db-f1f7b62d4d54/18551970428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/235eede8-f036-4b24-8bbd-4f9a06116c8a/45837138866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd660a77-633b-4d94-9a87-6d67f7869c57/rovabub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ed484f1-eb7d-4806-b76b-173569f80ca4/59206598237.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6431/5044/files/biology_if8765_worksheet_answers_page_47.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/1246/7106/files/kurufejodaritofukute.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3749/3928/files/dalowenegigidare.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_off000063e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E3 5088 bytes
SHA-256: c6af5e0f9c8814aa48381389320af30ee20d13361c5ce09211c4dc888133bbd4
font_01_sfnt_off000074fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74FB 10604 bytes
SHA-256: bbc87cda328b2dad0ab7af6324873135705e94ac8b5f610ca0b3d8facefe3622
font_02_sfnt_off0000993c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x993C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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