Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11351b0c720ea11…

MALICIOUS

PDF

39.8 KB Created: 2020-11-08 08:23:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 836b1663a005baa6bbb0cfb03714dc03 SHA-1: e165a596d8681b9395e3ff4e75e78ef5b9edc842 SHA-256: d11351b0c720ea1156a5060f38482615df7b9c5e1b01db85c0dd5e29955fc8b0
224 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that points to known malicious infrastructure. This suggests the primary goal is to redirect the user to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://traffking.ru/123?keyword=hotmail+sign+in+outlook+express In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_5f8cc23abecab.pdfIn PDF document text
    • https://junoxavod.weebly.com/uploads/1/3/1/3/131384771/8020923.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384822/normal_5fa5c73f44879.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b06249ed-c389-41cc-ad23-b19be5594bc6/wuwemize.pdfIn PDF document text
    • https://xixezavabude.files.wordpress.com/2020/11/sims_4_vampires_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9acef4a4-7775-4a47-82e7-4e248d2b1442/tilaw.pdfIn PDF document text
    • https://lusiwelop.files.wordpress.com/2020/11/bupasejarip.pdfIn PDF document text
    • https://lejijofovuza.files.wordpress.com/2020/11/72830967952.pdfIn PDF document text
    • https://petivubeso.files.wordpress.com/2020/11/83103461210.pdfIn PDF document text
    • https://kirozaber.files.wordpress.com/2020/11/danozova.pdfIn PDF document text
    • https://mebufaxokone.files.wordpress.com/2020/11/lavetiki.pdfIn PDF document text
    • https://gopalov.files.wordpress.com/2020/11/zazapemakumijege.pdfIn PDF document text
    • https://mipizitebo.files.wordpress.com/2020/11/41590282878.pdfIn PDF document text
    • https://winomosefari.files.wordpress.com/2020/11/tewupe.pdfIn PDF document text
    • https://lodoxepal.files.wordpress.com/2020/11/reremuradivuvevedivogobid.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C0E 5232 bytes
SHA-256: 92efe6eadb9be74dec3ea3b248849b15d0403ea240aaa35ed159c9b802e406f6
font_01_sfnt_off00006dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC3 10764 bytes
SHA-256: dfa8d50c5574ce885e33f2c2da40b0b035602379834366553658107139e410be

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