Malicious PDF — malware analysis report

Static analysis result for SHA-256 397aabceec2cbaef…

MALICIOUS

PDF

45.3 KB Created: 2020-11-09 16:16:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5e16558bf600b899bc690ebaf0699617 SHA-1: d5448d80bd36994953a4a4e98a1ed09c320792aa SHA-256: 397aabceec2cbaefaf6e1afd6fe97dcabd5f04178b286ba21e7880093c7d5210
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

The PDF document contains a lure for 'Product key for office 2016 free download' and embeds a large number of links to external PDF files, many hosted on disposable domains. One critical heuristic indicates a link to known malicious redirector infrastructure. Another heuristic flags the document for instructing the user to copy or paste clipboard content into a shell, suggesting an attempt to trick the user into executing commands. The ML classifier also strongly flagged this PDF as malicious.

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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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/aws?keyword=product+key+for+office+2016+free+download In PDF document text
    • https://nofakuxuwuxow.weebly.com/uploads/1/3/4/6/134684799/gaxexinisitelabofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447089/normal_5fa1ea7acd089.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427498/normal_5fa7d7239405b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366984/normal_5f87864730a9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416919/normal_5f9eceea84646.pdfIn PDF document text
    • https://sifukimoja.weebly.com/uploads/1/3/4/3/134357082/tapititerapibegozede.pdfIn PDF document text
    • https://fawefugixizim.weebly.com/uploads/1/3/1/3/131383791/1850296.pdfIn PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/02c41aa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412780/normal_5f9e792d8abdf.pdfIn PDF document text
    • https://doxeduzawixufak.weebly.com/uploads/1/3/4/3/134383044/8840206.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/3722212.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/1d9f244e-36e6-4dfc-867c-8102029792ee/97688212140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3c5cbb2-8468-474b-84a3-7da5ffead246/wasowasuxotipix.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_off000070c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70C4 5576 bytes
SHA-256: a2bba2b8b50d231572ce9fa6090f2d07e69578419e9312cff1127ea150a7ed1b
font_01_sfnt_off000083f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83F9 10716 bytes
SHA-256: 8d6d3da11c494047a9dc188353a2e1ba5e969ba2b007387bfed66f6140a83538

Open this report in the interactive analyzer, or submit your own file for analysis.