Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9a4e6f8063d597…

MALICIOUS

PDF

68.4 KB Created: 2020-10-03 12:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ab277809029831183a73bdd757910e10 SHA-1: 5e52e3a8dcf1ca9fad6f4193bcdae07903fe6228 SHA-256: 8c9a4e6f8063d597ef69f7c566481855a3293813c3e2238f6437b2e74f092754
192 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches one of the extracted links, suggesting a lure to a study guide. The ML classifier strongly supports the malicious verdict. No scripts were extracted, but the primary attack pattern involves redirecting users to malicious sites.

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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=hesi+rn+exit+exam+study+guide In PDF document text
    • https://site-1037240.mozfiles.com/files/1037240/86341011166.pdfIn PDF document text
    • https://site-1036625.mozfiles.com/files/1036625/tuvoxurudidedepejemi.pdfIn PDF document text
    • https://site-1037218.mozfiles.com/files/1037218/bibavatapofopotipunimi.pdfIn PDF document text
    • https://site-1037035.mozfiles.com/files/1037035/rulidumidatefibubak.pdfIn PDF document text
    • https://site-1038349.mozfiles.com/files/1038349/lunudupu.pdfIn PDF document text
    • https://site-1037176.mozfiles.com/files/1037176/nesomodugixopuvozofufi.pdfIn PDF document text
    • https://site-1037075.mozfiles.com/files/1037075/mozidodetulajabisej.pdfIn PDF document text
    • https://site-1037897.mozfiles.com/files/1037897/rixetanelewutuzurufisot.pdfIn PDF document text
    • http://lited.omshantiyogaspain.com/uploads/1/3/1/3/131384281/bf292a463.pdfIn PDF document text
    • http://lamaxi.wrangellsda.org/uploads/1/3/2/6/132683292/81d2d854a87886f.pdfIn PDF document text
    • http://kizixi.ballisticarmordefense.com/uploads/1/3/0/9/130969940/9116696.pdfIn PDF document text
    • http://files.theneoneffect.com.au/uploads/1/3/0/8/130813366/kapifop-gigugizuvemil-vugotujil-wajoj.pdfIn PDF document text
    • http://files.rachelmeetsplanet.com/uploads/1/3/1/4/131454670/61d739.pdfIn PDF document text
    • http://files.livingourpotential.org/uploads/1/3/2/7/132712551/4b5d149528bb0e.pdfIn PDF document text
    • http://files.iboyle.com/uploads/1/3/1/8/131871821/fe692.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
    • 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_off0000bfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD0 5016 bytes
SHA-256: 55e5a98279c48543f74448bcb10e5a1d3c02bbc6f585b733cf4bba32d39454fb
font_01_sfnt_off0000d0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C0 11100 bytes
SHA-256: af0c444ff723103228660646e78818cc151921868c1fc0550eaae51d77c9ce2c
font_02_sfnt_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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