Malicious PDF — malware analysis report

Static analysis result for SHA-256 5375d3e9bee1c21e…

MALICIOUS

PDF

42.5 KB Created: 2020-09-30 06:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3153976da66e2976119d4e1fc195cf18 SHA-1: 3e59b8693872bcd397f0b7515761e8fd32bbfd29 SHA-256: 5375d3e9bee1c21e434919623a4a999245157d6fbce65a69fe2cece3ccec2ebf
132 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to disposable domains and redirector infrastructure, indicating a likely attempt to distribute malware or lead users to phishing sites. The ML classifier strongly flagged this PDF as malicious, and the presence of a "download button" heuristic further supports a malicious intent. The document body itself is heavily obfuscated but contains URLs that are also present in the embedded link list.

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://gettraff.ru/strik?keyword=bridgemaster+e+radar+service+manual+pdf In PDF document text
    • http://files.howecycle.com/uploads/1/3/1/4/131408791/8698367.pdfIn PDF document text
    • http://lugabuwo.90sinmypocket.com/uploads/1/3/1/1/131164358/174324.pdfIn PDF document text
    • http://kidano.stchristophers-mn.org/uploads/1/3/1/8/131857241/jixumumil.pdfIn PDF document text
    • https://site-1036632.mozfiles.com/files/1036632/zobev.pdfIn PDF document text
    • http://files.ambroidery.com/uploads/1/3/1/6/131606874/a767b.pdfIn PDF document text
    • http://files.madsincinema.com/uploads/1/3/0/7/130775653/9922003.pdfIn PDF document text
    • http://wixexe.trupbsc.ca/uploads/1/3/1/0/131069869/4468639.pdfIn PDF document text
    • https://site-1036649.mozfiles.com/files/1036649/28522922493.pdfIn PDF document text
    • https://site-1036941.mozfiles.com/files/1036941/85966228372.pdfIn PDF document text
    • https://site-1037188.mozfiles.com/files/1037188/96340536159.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00005d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D20 5584 bytes
SHA-256: f8185d711fe164fcaee7861ac5be599065adb28f39e46692ccfd8af6123bc7c1
font_01_sfnt_off00007014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7014 14348 bytes
SHA-256: 4fc0815a18fb86635a6ef436d98b1688d343eea3db3abb4aaa98fa2ca43ab244

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